Symphyotrichum kentuckiense (formerly Aster kentuckiensis) is a rare species of flowering plant in the Asteraceaefamily and is commonly known as Kentucky aster, Price's aster, Miss Price's aster, Sadie's aster, or lavender oldfield aster. It is a perennial, herbaceous plant that is endemic to broken limestonecedar glades and roadsides in Alabama, Georgia, Kentucky, and Tennessee. It blooms from August through October, reaches heights between 30 centimeters (1 foot) and 100 cm (3.3 ft), and has green to reddish-brown stems. It is a nearly hairless plant with blue to blue-violet ray florets.
Symphyotrichum priceae was once considered the name of the plant, with S. kentuckiense and Aster kentuckiensis placed as its taxonomic synonyms. In 2021, botanist MaxE. Medley proposed that this treatment was incorrect. As of October 2022[update], what was originally described as Aster priceae was accepted to be the hybrid between S. kentuckiense and Symphyotrichum pilosumvar. pilosum and has been named Symphyotrichum× priceae.[3] The hybrid is a somewhat hairy plant rather than a hairless one, and its characteristics are intermediate between its parents.
Basal leaves from early season growth that have sprouted from a crack in limestone
Inflorescence branch photo with fascicles (clusters of leaves) labeled with arrows
Symphyotrichum kentuckiense is a rare[4]perennial, herbaceous plant[5]endemic[4] to areas of Alabama, Georgia, Kentucky, and Tennessee in the southeastern United States.[6] It flowers from August through October, growing to heights between 30 centimeters (1 foot) and 100 cm (3.3 ft) from a cespitose rootstock. The rootstock has short, branched underground caudices and no rhizomes.[5]
Stems
S. kentuckiense has from one to three or more glabrous (hairless) stems extending from the root base. These stems can be decumbent, growing horizontally along the ground and turned up at the ends,[b] to ascending. They are green to reddish-brown.[5]
Basal leaves are either without leafstalks (called petioles), making them sessile, or they have very short petioles with sheathingwings that are fringed with hairs on their edges, making them ciliate. The basal leaves are oblanceolate[h] to obovate[i] with obtuse[e] apices, and their bases are cuneate[j] (wedge-shaped) to attenuate.[k] Their margins (edges) are entire, meaning they are smooth with no teeth or lobes. Rarely, they can be sparsely saw-toothed, also called serrate. Basal leaves range in lengths from 10 to 70 millimeters (0.4 to 2.8 inches) and widths from 3 to 5 mm (0.12 to 0.20 in). The basal leaves grow in a rosette that develops prior to flowering. These leaves wither or die during plant growth, and at the time of flowering, another rosette of basal leaves forms.[5]
Lower and middle stem leaves are sessile or may have petioles with narrow wings. They usually wither by the time the plant flowers. The leaves are oblanceolate[h] to linear-oblanceolate and range in lengths of 70 to 105 mm (2.8 to 4.1 in) and widths of 2 to 4 mm (0.08 to 0.16 in). They have attenuate[k] to cuneate[j] bases that can be auriculate[l] (shaped like earlobes) or clasp the stem.[5]
The linear-lanceolate[m][n] to narrowly subulate[o]distal[p] leaves are sessile and get progressively smaller as they approach the flower heads. Distal leaf bases are subauriculate[l] (somewhat earlobe-shaped) and can clasp the stem. Their margins are entire but have cilia closer to the branches. These leaves are glabrous on both sides and range in lengths of 5 to 65 mm (0.2 to 2.6 in) and widths of 1 to 4 mm (0.04 to 0.16 in). The small, 3-nerved inflorescence leaves are often formed in clusters called fascicles.[5]
Flowers
S. kentuckiense flower head morphology
Bract, involucre, and phyllary detail
Flower head, top view
Ray floret detail
Disk floret detail
Diagram of a cypsela, with pappi labeled
Symphyotrichum kentuckiense is a late-summer and fall blooming perennial,[5] with flower heads that are about 25 mm (1 in) wide[8] and have blue,[9] blue-violet,[5] pink, or purple ray florets[8] opening August through October. The flower heads grow in leafy paniculiform to racemiform arrays on inflorescences that are straight and ascending or can have wide angles between the branches. Divaricate branching[5] can cause the plant to appear as a small shrub.[10] At times, the flower heads can be secund, appearing on one side of the branch.[5]
Each flower head is on a glabrous peduncle that ranges from 4 to 20 mm (0.16 to 0.79 in) in length. There are 3 to 6 linear to subulate[o] and stiff, glabrous bracts on each peduncle. Bracts closest to the heads can be so long that their lengths exceed the heights of the involucres.[5]
Involucres and phyllaries
On the outsides of the flower heads of all members of the family Asteraceae are small bracts that look like scales. These are called phyllaries, and together they form the involucre that protects the individual flowers in the head before they open.[q][11] The involucres of Symphyotrichum kentuckiense are cylindric in shape and usually 5.5 to 7.1 mm (0.22 to 0.28 in) in length, although they can be as short as 4.5 mm (0.18 in) and as long as 8.5 mm (0.33 in).[5]
The glabrous phyllaries of S. kentuckiense are in 4 to 6 unequal to subequal rows,[5] linear-subulate[m][o] in shape, and gradually acuminate.[d][8] The margins of each phyllary may appear white or light green but are translucent. The phyllaries have green chlorophyllous zones that are diamond-shaped to lanceolate[n] with apices that are acute[c] to long-acuminate,[d] mucronate[f] to apiculate,[r] such that they could be tapering to a slender point.[5] They are revolute (they roll inwards on the margins)[8] and spread away from the head.[5]
Florets
Each flower head is made up of ray florets and disk florets. The 20 to 28[s] ray florets grow in one series and are usually blue-violet, rarely white. They are usually between 9 and 15 mm (0.35 and 0.59 in) in length, but can be as short as 7 mm (0.28 in) and as long as 19 mm (0.75 in). They are 0.6 to 2.1 mm (0.02 to 0.08 in) wide.[5]
The disks have 33 to 51[t] florets that start out as yellow and after opening, turn brown after pollination. Each disk floret is 3.4 to 4.6 mm (0.13 to 0.18 in) in depth (sometimes up to 5 mm (0.2 in)), and is made up of 5 petals, collectively a corolla, which open into 5 lanceolate lobes comprising 0.5 to 1 mm (0.02 to 0.04 in) of the depth of the floret.[5]
Fruit
The fruits (seeds) of Symphyotrichum kentuckiense are not true achenes but are cypselae, resembling an achene but surrounded by a calyx sheath. This is true for all members of the Asteraceae family.[12] After pollination, they become tan to brown with an obovoid[i] shape, 1.5 to 2.1 mm (0.06 to 0.08 in) in length with 4 to 5 thin nerves, and with a few stiff, slender bristles on their surfaces (strigillose). They also have tufts of hairs (pappi) which are white and 3 to 5 mm (0.12 to 0.20 in) in length.[5]
Chromosomes
The species has a monoploid number (also called base number) of eight chromosomes(x = 8). It has eight sets of its chromosomes, meaning it is octaploid, giving it a total chromosome count of 64.[6]
At the same time that she collected what became the holotype for Aster kentuckiensis, SadieF. Price collected a similar plant that Britton named Aster priceaeBritton and included in its description that it is pubescent, or with soft hairs.[8] In later floras by other authors, A. kentuckiensis was synonymized to A. priceae. In a 2021 journal article by botanist MaxE. Medley, elements of the morphologies of A. kentuckiensis and A. priceae were confirmed to have been erroneously combined, and sometimes the former was ignored. Notably, this treatment resulted in floras written prior to Medley's paper applying the glabrous trait to A. priceae and S. priceae, which is incorrect, as this plant is puberulent.[15]
In 1948, botanist Arthur Cronquist reduced Aster priceae to a variety of A. pilosus named A. pilosus var.priceae(Britton) Cronquist[16] which Medley posited was a conclusion "based on misidentified specimens and [was] not appropriate."[17] Subsequently, it was considered the non-hybrid species Symphyotrichum priceae(Britton) G.L.Nesom with S. kentuckiense and A. kentuckiensis as its taxonomic synonyms.[5][9]
Medley suggested that the Aster priceae holotype and Britton's protologue were of the hybridA. kentuckiensis ×A. pilosus var.pilosus.[15] He gave it the hybrid designation and acknowledged the name as Symphyotrichum ×priceae(Britton) G.L.Nesom,[3] with Aster priceaeBritton as its basionym.[18] Corrected synonyms of S. × priceae are A. priceae and A. pilosus var.priceae(Britton) Cronquist. As of October 2022[update], this hybrid name was accepted by Plants of the World Online (POWO).[3] The hybrid is a puberulent plant rather than a glabrous one, and its characteristics are intermediate between its parents.[9]
Comparison of S.kentuckiense, S.×priceae, and S.pilosumvar. pilosum
Part of an inflorescence of S.kentuckiense showing glabrous stem, many flower heads, and one in bloom with blue-violet ray florets
Part of a S.×priceae plant showing puberulent stem and two flower heads, one opened and with blue-violet ray florets
Part of an inflorescence of S.pilosumvar. pilosum showing pubescent stems and several white flower heads
Etymology
The specific epithet (second part of the scientific name) kentuckiense is a Latinization of the name of the state of Kentucky where the holotype was found. The hybrid's specific epithet priceae is a Latinization of the surname of the collector, Sadie F. Price.[8] The species has the common names of Kentucky aster,[6] Price's aster,[9] Miss Price's aster, Sadie's aster,[4] and lavender oldfield aster.[5] "Old field asters" is a common name for subsect. Porteriani.[13]
Symphyotrichum kentuckiense[a] has coefficients of conservatism(C-values) in the Floristic Quality Assessment (FQA)[22][23] of 7 and 8 depending on evaluation region.[19] The higher the C-value, the lower tolerance the species has for disturbance and the greater the likelihood that it is growing in a presettlement natural community.[24] When it grows in the Appalachian Mountain EPA Ecoregions of 67 and 68,S. kentuckiense has a C-value of 7. In the Interior Plateau EPA Ecoregions of 71 and 72, its C-value is 8.[19] Both of these C-values mean that its populations are found in high-quality remnant natural areas with little environmental degradation but can tolerate some periodic disturbance.[24]
Conservation
As of October 2022[update], NatureServe listed S. kentuckiense[a] as Apparently Secure (G4) globally; Apparently Secure (S4) in Georgia; Imperiled (S2) in Kentucky; and, Critically Imperiled (S1) in South Carolina.[u] The species' global status was last reviewed on 2 May 1988.[1]
Notes
^ abcddocumented or listed as Symphyotrichum priceae
^ abAcute is defined as a short and sharp point at less than a 90° angle.
^ abcAcuminate is defined as "[t]apering to a long point in a concave manner". (Copied definition from Glossary of leaf morphology; see that page's history for attribution.)
^ abObtuse is defined as a blunt angle greater than 90°.
^ abMucronate is defined as "end[ing] abruptly in a sharp point as a continuation of the midrib". (Copied definition from Glossary of leaf morphology; see that page's history for attribution.)
^Cuspidate is defined as having a tip with a sharp and long rigid cusp.
^ abOblanceolate is defined as "[m]uch longer than wide and with the widest portion near the tip, reversed lanceolate". (Copied definition from Glossary of leaf morphology; see that page's history for attribution.)
^ abObovate is defined as "[t]eardrop-shaped, stem attaches to the tapering end; reversed ovate". (Copied definition from Glossary of leaf morphology; see that page's history for attribution.)
^ abCuneate base is defined as "[t]riangular, wedge-shaped" where the leaf attaches to the stem. (Part of this definition was copied from Glossary of leaf morphology; see that page's history for attribution.)
^ abAttenuate base is defined as "[h]aving leaf tissue taper down the petiole to a narrow base, always having some leaf material on each side of the petiole". (Copied definition from Glossary of leaf morphology; see that page's history for attribution.)
^ abAuriculate base is defined as "[h]aving ear-shaped appendages reaching beyond the attachment to the petiole or to the stem". (Copied definition from Glossary of leaf morphology; see that page's history for attribution.)
^ abLinear is defined as long and narrow; an example is a blade of lawn grass.
^ abLanceolate is defined as "[l]ong, wider in the middle, shaped like a lance tip". (Copied definition from Glossary of leaf morphology; see that page's history for attribution.)
^Apiculate is defined as "tapering and ending in a short [and] slender point". (Copied definition from Glossary of leaf morphology; see that page's history for attribution.)
Farlex (n.d.). "divaricate". The Free Dictionary. Retrieved 5 October 2022.
Freyman, W.A. (2022). "Universal FQA: Compare species coefficients". universalfqa.org. Chicago: Openlands. Retrieved 2 October 2022. Choose 'FQA Databases', then 'Compare Species Coefficients', then enter search term 'Symphyotrichum priceae'.
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