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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.

 

STYLOCLINE NESTSTRAW

James D. Morefield


Annual 1–10(20) cm, generally ± gray, cobwebby to tomentose. Stem: 1, erect, or 2–10+, ascending to decumbent, ± forked, generally evenly leafy proximally, ± leafless between distal forks. Leaf: alternate, ± sessile, generally elliptic to oblanceolate, entire; distal leaves subtending heads, crowded, largest wider than proximal leaves. Inflorescence: heads disciform, ± sessile, 2–10 per (dense) group; involucre 0 or vestigial, simulated by paleae, or ± cup-like (then phyllaries 1–4, ± unequal, like reduced paleae); receptacle length (2.8)4–8 × width, ± cylindric to club-shaped, glabrous; paleae of pistillate flowers each generally enclosing flower, or outermost open, deciduous with fruit, ± boat-shaped, acute to obtuse, ± woolly abaxially, obscurely parallel-veined (veins 5+), margin reflexed distally or fully as scarious wing, wing terminal, erect to curved inward, visible in head; paleae of disk flowers generally 2–5, reduced, erect, ± folded, lanceolate, acute, papery, scarious, glabrous or cobwebby. Pistillate flower: 12–25+, all subtended by paleae; corolla obscure, narrowly cylindric. Disk flower: staminate (ovary partly developed in some species), 2–6; pappus of (0)1–10(13) free, deciduous bristles, hidden in head; corolla generally 5-lobed; anther base tailed, tip ± triangular; style tips ± linear-oblong. Fruit: each enclosed by palea, ± obovoid, variously compressed, smooth, shiny, corolla scar ± terminal, pappus 0.
7 species: southwestern North America. (Greek: column bed, for long receptacle) [Morefield 2006 FNANM 19:450–453] Close to Logfia. See also Ancistrocarphus, Micropus.

Key to Stylocline

1. Longest paleae winged throughout, wing widest in proximal 2/3 of palea; phyllaries 1–3.5 mm, cordate or elliptic to obovate, ± persistent

2. Wing of longest palea elliptic to ± obovate; disk flower ovary (0.2)0.3–0.6 mm; disk pappus bristles (5)6–12(13); heads woolly, dull, hairs evident ..... S. citroleum

2' Wing of longest palea ± cordate; disk flower ovary 0–0.2 mm; disk pappus bristles 1–5(6); heads ± cobwebby, often shiny, hairs hidden by palea wings ..... S. gnaphaloides

1' Longest paleae winged distally, wing widest in distal 1/3 of palea; phyllaries 0 or <= 0.5 mm, ± awl-shaped, deciduous

3. Receptacle 2.8–3.5 × width, club-shaped; disk flower ovary 0.3–0.6 mm; fruit 0.6–0.8 mm; heads nearly spheric, largest 3–4 mm diam; longest paleae 1.9–3.1 mm; proximal leaves obtuse ..... S. sonorensis

3' Receptacle 4–8 × width, ± cylindric; disk flower ovary 0–0.3(0.4) mm; plant with > 1 of the following: fruit 0.8–1.6 mm, heads ovoid to fusiform, largest heads 5–9 mm diam, longest paleae 3.4–4.5 mm, proximal leaves acute

4. Heads ± spheric, woolly, largest 5–9 mm diam; longest paleae 3.4–4.5 mm; outermost paleae ± closed

5. Bodies of longest paleae cartilaginous; fruit compressed front-to-back; largest distal leaves 4–11 mm, all ± elliptic to oblanceolate, distal-most generally 0.8–1.2 × heads ..... S. intertexta

5' Bodies of longest paleae except midvein papery; fruit compressed laterally; largest distal leaves (7)11–17 mm, some or all awl-shaped to lanceolate, distal-most generally 1.5–2 × heads ..... S. micropoides

4' Heads ovoid to fusiform, tomentose, largest 1.5–4 mm diam; longest paleae 2–3.3 mm; outermost paleae open, concave

6. Largest heads 1.5–2.5 mm diam; longest palea 2–2.7 mm; fruit 0.7–1 mm; disk corolla 0.8–1.1 mm, generally 4-lobed; leaves obtuse, not mucronate ..... S. masonii

6' Largest heads 2.5–4 mm diam; longest palea 2.8–3.3 mm; fruit 1.1–1.6 mm; disk corolla 1.1–1.7 mm, generally 5-lobed; leaves ± acute, mucronate ..... S. psilocarphoides

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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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