Key to Stylocline

View taxon page for Stylocline

(For a list of species in Stylocline, use the above link.)

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Longest paleae winged throughout, 

wing 

1. Thin, flat extension or appendage of a surface or margin. 2. In many members of Fabaceae and in some other groups, each of two lateral petals.

widest in proximal 2/3 of 

palea 

1. In Asteraceae, a scale-like bract that subtends an individual flower on the receptacle (equal to 'chaff scale' in TJM), absent in some genera, restricted to a ring separating ray and disk flowers in most tarweed species. 2. In Poaceae, the distal, generally smaller of two sheathing bracts subtending a flower, generally two-veined and -keeled and ensheathed by the lemma; with the lemma and flower, comprising the floret.

; phyllaries 1–3.5 mm, 

cordate 

Heart-shaped; often pertaining to a leaf in which the blade base on both sides of the petiole is rounded and convex.

or 

elliptic 

In the shape of a flattened circle or ellipse; wider than linear

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 

Having a short-tapered, blunt tip or base, the sides convex or straight and converging at more than a right angle.

..... S. sonorensis

3' Receptacle 4–8 × width, ± 

cylindric 

Elongate, with parallel sides and, at any point, round in transverse section.

; 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 

Elongate, widest at the middle, tapered to both ends.

, largest heads 5–9 mm diam, longest paleae 3.4–4.5 mm, proximal leaves 

acute 

Having a short-tapered, sharp tip, the sides convex or straight and converging at less than a right angle.

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 

Flattened side-to-side or front-to-back.

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 

Narrowly elongate, widest in the basal half, often tapered to an acute tip.

, distal-most generally 1.5–2 × heads ..... S. micropoides

4' Heads ovoid to fusiform, 

tomentose 

Covered with densely interwoven, generally matted hairs.

, 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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