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Published In: Rhodora 17(199): 135. 1915. (Rhodora) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 5/11/2019)
Acceptance : Accepted
 

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1. Krigia biflora (Walter) S.F. Blake var. biflora (two-flowered Cynthia, orange dwarf dandelion)

K. biflora f. glandulifera Fernald

Pl. 257 j, k; Map 1072

Plants perennial, the short rootstock with fibrous roots, the main roots often slightly fleshy. Stems 1 to few, 10–60 cm long, erect or ascending, with few to several ascending branches from above the midpoint, glabrous or sparsely to moderately pubescent toward the branch tips with spreading, gland-tipped hairs, occasionally somewhat glaucous. Leaves basal and usually 1–5 alternate along the lower stems, the primary (and sometimes also secondary) branch point with 1 or 2 well-developed, bractlike leaves, the basal and lower stem leaves mostly short- to more commonly long-petiolate (the petiole sometimes winged), those higher on the stem abruptly different, sessile with rounded, clasping bases. Blades of basal and lower stem leaves 2–10 cm long, broadly obovate to oblong-oblanceolate, entire, wavy, toothed, or uncommonly shallowly to deeply pinnately lobed, the teeth spreading, mostly broadly triangular-pointed, the lobes usually oblong-rounded, the leaf tip rounded to bluntly pointed, the surfaces glabrous, usually at least the undersurface glaucous. Blades of median and upper stem leaves similar to the others but linear to narrowly oblong-ovate. Involucral bracts 10–18, 7–11 mm long, lanceolate, flat (not keeled), glabrous, withering and becoming reflexed with age. Ligulate florets 25–60. Corollas 12–25 mm long, yellowish orange to orange. Pappus of 20–40 bristles and 10(–15) short, inconspicuous scales, the bristles 4.0–5.5 mm long, off-white to very light tan, the scales 0.3–0.5 mm long, mostly lanceolate, transparent. Fruits 2–3 mm long, more or less cylindrical (slightly expanded at the tip, slightly tapered at the base), more or less circular in cross-section, with 12–15 blunt, broad ribs, these microscopically roughened or barbed, reddish brown to dark brown. 2n=10, 20. May–August.

Scattered in the Ozark and Ozark Border Divisions and the eastern portion of the Glaciated Plains; uncommon in the Mississippi Lowlands Division (eastern U.S. and adjacent Canada west to Minnesota, Kansas, and Oklahoma). Mesic to dry upland forests, upland prairies, margins of ponds and sinkhole ponds, and banks of streams; also pastures and roadsides.

Plants that occur disjunctly in portions of Arizona, Colorado, and New Mexico consistently have slightly smaller leaves and shorter stems than those in the main portion of the species’ distribution. These have been segregated as var. viridis (Standl.) K.-J. Kim, although whether these differences are due to environmental or genetic variation has not been well studied.

 


 

 
 
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