Symphyotrichum kentuckiense
is a rare species of flowering plant in the Asteraceae family and is commonly known as,,,, or. It is a perennial, herbaceous plant that is endemic to broken limestone cedar glades and roadsides in Alabama, Georgia, Kentucky, and Tennessee. It blooms from August through October, reaches heights between and, 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 ' and Aster kentuckiensis placed as its taxonomic synonyms. In 2021, botanist MaxE. Medley proposed that this treatment was incorrect., what was originally described as Aster priceae was accepted to be the hybrid between ' and Symphyotrichum pilosumvar. pilosum and has been named Symphyotrichum× priceae. The hybrid is a somewhat hairy plant rather than a hairless one, and its characteristics are intermediate between its parents.
NatureServe considers Apparently Secure (G4) globally and Imperiled in Kentucky where the holotype was collected near Bowling Green in October 1898 by botanist Price. Aster kentuckiensis was then formally described by botanist Nathaniel Lord Britton in 1901.
Description
Symphyotrichum kentuckiense is a rare perennial, herbaceous plant endemic to areas of Alabama, Georgia, Kentucky, and Tennessee in the southeastern United States. It flowers from August through October, growing to heights between and from a cespitose rootstock. The rootstock has short, branched underground caudices and no rhizomes.Stems
has from one to three or more glabrous stems extending from the root base. These stems can be decumbent, growing horizontally along the ground and turned up at the ends, to ascending. They are green to reddish-brown.Leaves
The species has thin alternate leaves that are dark green to bluish-green with glabrous faces. Leaves occur at the base, on stems, and on inflorescence branches. Depending upon the locations of the leaves on the plant, the apices, or tips, can be noticeably pointed, obtuse, mucronate, or cuspidate.Basal leaves are either without leafstalks, making them sessile, or they have very short petioles with sheathing wings that are fringed with hairs on their edges, making them ciliate. The basal leaves are oblanceolate to obovate with obtuse apices, and their bases are cuneate to attenuate. Their margins 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 and widths from. 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.
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 to linear-oblanceolate and range in lengths of and widths of. They have attenuate to cuneate bases that can be auriculate or clasp the stem.
The linear-lanceolate to narrowly subulate distal leaves are sessile and get progressively smaller as they approach the flower heads. Distal leaf bases are subauriculate 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 and widths of. The small, inflorescence leaves are often formed in clusters called fascicles.
Flowers
Symphyotrichum kentuckiense is a late-summer and fall blooming perennial, with flower heads that are about wide and have blue, blue-violet, pink, or purple ray florets 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 can cause the plant to appear as a small shrub. At times, the flower heads can be secund, appearing on one side of the branch.Each flower head is on a glabrous peduncle that ranges from in length. There are linear to subulate 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.
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. The involucres of Symphyotrichum kentuckiense are cylindric in shape and usually in length, although they can be as short as and as long as.The glabrous phyllaries of are in to subequal rows, linear-subulate in shape, and gradually acuminate. 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 with apices that are acute to long-acuminate, mucronate to apiculate, such that they could be tapering to a slender point. They are revolute and spread away from the head.
Florets
Each flower head is made up of ray florets and disk florets. The ray florets grow in one series and are usually blue-violet, rarely white. They are usually between in length, but can be as short as and as long as. They are wide.The disks have florets that start out as yellow and after opening, turn brown after pollination. Each disk floret is in depth, and is made up of, collectively a corolla, which open into 5 lanceolate lobes comprising of the depth of the floret.
Fruit
The fruits 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. After pollination, they become tan to brown with an obovoid shape, in length with nerves, and with a few stiff, slender bristles on their surfaces. They also have tufts of hairs which are white and in length.Chromosomes
The species has a monoploid number of eight chromosomes It has eight sets of its chromosomes, meaning it is octaploid, giving it a total chromosome count of 64.Taxonomy
Classification
Symphyotrichum kentuckiense is classified in subgenus Symphyotrichum section Symphyotrichum subsection Porteriani. This subsection contains four species in addition to : S.depauperatum, S.parviceps, S.pilosum, and S.porteri. It is the only octaploid within the subsection.History
The basionym of Symphyotrichum kentuckiense is Aster kentuckiensis. Its name with author citations is Symphyotrichum kentuckiense. The plant was formally described as a unique species and named Aster kentuckiensis by botanist Nathaniel Lord Britton in 1901 in his publication Manual of the Flora of the Northern States and Canada. The sample that was used by Britton as the holotype for was collected in October 1898 by SadieF. Price near Bowling Green, Kentucky.Hybrid ''Symphyotrichum''× ''priceae''
At the same time that she collected what became the holotype for Aster kentuckiensis, SadieF. Price collected a similar plant that Britton named Aster priceae and included in its description that it is pubescent, or with soft hairs. In later floras by other authors, ' was synonymized to '. In a 2021 journal article by botanist MaxE. Medley, elements of the morphologies of ' and ' 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 ' and ', which is incorrect, as this plant is puberulent.In 1948, botanist Arthur Cronquist reduced Aster priceae to a variety of named priceae which Medley posited was a conclusion "based on misidentified specimens and not appropriate." Subsequently, it was considered the non-hybrid species Symphyotrichum priceae with ' and ' as its taxonomic synonyms.
Medley suggested that the Aster priceae holotype and Britton's protologue were of the hybrid pilosus. He gave it the hybrid designation and acknowledged the name as priceae, with Aster priceae as its basionym. Corrected synonyms of are and priceae., this hybrid name was accepted by Plants of the World Online. The hybrid is a puberulent plant rather than a glabrous one, and its characteristics are intermediate between its parents.
Etymology
The specific epithet 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, Price. The species has the common names of Kentucky aster, Price's aster, Miss Price's aster, Sadie's aster, and lavender oldfield aster. "Old field asters" is a common name for subsect. Porteriani.Distribution and habitat
Symphyotrichum kentuckiense is endemic to a limited range in the southeastern United States, specifically parts of Alabama, Georgia, Kentucky, and Tennessee. Hybrid has been documented only in Kentucky. ' grows in the Appalachian Mountain EPA Ecoregions Ridge and and Southwestern, and in the Interior Plateau EPA Ecoregions of Interior Low and Interior River Valleys and . It is adapted to and known from breaks or cracks in limestone cedar glades or limestone roadsides. It can be found at in dry soil.' is categorized on the United States National Wetland Plant List with the wetland indicator status rating of Facultative Upland in the Eastern Mountains and Piedmont region. This rating means that it usually occurs in non-wetlands within its range, but can occasionally be found in wetlands.