Porophyllum scoparium
Porophyllum
shrubby poreleaf, trans-Pecos poreleaf
poreleaf
erect, usually strictly branched.
blades mostly filiform, 10–40 × 1–2 mm.
cauline; opposite or alternate; petiolate or sessile;
blades orbiculate to linear or filiform, margins crenate or entire, faces usually glabrous (oil-glands scattered and/or at margins).
cylindric to campanulate [turbinate], 3–12 mm diam.
convex to conic, pitted, epaleate.
mostly 40–80+;
corollas yellow, 5–8 mm.
0.
(5–)10–80[–100+], bisexual, fertile;
corollas usually yellow, sometimes whitish to greenish or purplish [brownish], tubes either very slender, much longer than funnelform throats, or stout, much shorter than narrowly cylindric throats, lobes 5, deltate to lanceolate (often unequal).
7–10, oblanceolate to linear, 6–10 mm.
5–10 in ± 2 series (distinct to bases, oblong or lanceolate to linear, bearing oval to linear oil-glands).
0.
discoid, borne singly or in loose, ± corymbiform arrays.
3.5–5.5 mm;
pappi: longer bristles 6–7.5 mm.
cylindric to fusiform, hirtellous to villous [glabrous];
pappi persistent, of 25–50(–100) coarse to fine bristles in 1–2+ series.
= 12.
= 24.
Porophyllum scoparium
Porophyllum
Species ca. 25 (5 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Annuals; leaf blades oval or elliptic to obovate, 8–25+ mm wide | P. ruderale |
1. Perennials, or subshrubs or shrubs; leaf blades linear to filiform, 1–5 mm wide | → 2 |
2. Corollas whitish or purplish | P. gracile |
2. Corollas yellow (sometimes tinged reddish) | → 3 |
3. Subshrubs or shrubs, 20–60+ cm; phyllaries 7–10 | P. scoparium |
3. Perennials (rarely woody at bases), mostly 5–30 cm; phyllaries 5(–8) | → 4 |
4. Internodes mostly 1–5(–12) mm; leaf blades 8–15 × 2 mm; pappi: longer bristles 6–7 mm | P. pygmaeum |
4. Internodes mostly 10–20+ mm; leaf blades 20–60 × 1–2 mm; pappi: longer bristles 8–10 mm | P. greggii |
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USDA Plants Database
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