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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

OREOSTEMMA ASTER

Guy L. Nesom


Perennial herb, from taproot or thick rhizome, sometimes with branched caudex. Stem: decumbent-ascending to erect, unbranched, ± scape-like, generally distally finely loose-tomentose, glandless or stalked-glandular. Leaf: most basal in rosette, sessile, linear to oblanceolate, 3-veined, entire, glabrous to sparsely long-soft-hairy or stalked-glandular. Inflorescence: heads radiate, 1; involucre broadly top-shaped; phyllaries ± equal or graduated in (2)3–4 series, generally ± purple, linear to linear-elliptic or oblanceolate, leaf-like in texture (or proximal margins ± hardened), glabrous to loose-tomentose; receptacle flat, shallowly pitted, epaleate. Ray flower: 10–40; corolla ± white to purple. Disk flower: corolla tubular, yellow; anther tip ovate-triangular; style branch appendages lance-linear, 1.5–2.2 mm. Fruit: 4–5 mm, narrowly cylindric, ± brown, ribs 5–10, raised, faces glabrous or sparsely short-strigose; pappus ± white, of minutely barbed bristles in 1 series, sometimes also with few short bristles or hairs.
3 species: western United States and adjacent Canada. (Greek: mountain + crown) [Nesom 2006 FNANM 20:359–361]
Unabridged references: [Nesom 1993 Phytologia 74:305–316]
Unabridged note: Oreostemma is distinguished by a basal rosette of narrow, 3-veined leaves, solitary heads on - scapose stems, top-shaped involucres with (2)3–4 series of ± equal, evenly herbaceous phyllaries, pink to purple rays, greatly elongate style-branch appendages, and cylindric fruits.

Key to Oreostemma

1. Stem, phyllaries, and often leaves densely short-stalked-glandular; stems 2–7 cm; leaves linear ..... O. peirsonii

1' Stem, phyllaries, and leaves glandless, glabrous or long-soft-hairy; stems 4–70 cm; leaves oblanceolate

2. Herbage, phyllaries ± glabrous to ± long-soft-hairy, always some hairs distally on peduncle and proximally on phyllaries; phyllaries leaf-like in texture and color or with a tan, slightly hardened base, outer proximally 0.8–1.2 mm wide, 1-veined ..... O. alpigenum var. andersonii

2' Herbage, phyllaries glabrous; phyllaries strongly hardened, proximally straw-colored, outer proximally 1.5–2 mm wide, 3-veined, veins dividing phyllary into 4 bands ..... O. elatum

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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