Hymenoxys bigelovii |
Hymenoxys quinquesquamata |
|
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Bigelow's rubberweed |
rincon rubberweed, rincon rubberweed or bitterweed |
|
Habit | Perennials, 20–70 cm (polycarpic, often with sparingly branched, woody caudices). | Perennials, 30–100 cm (polycarpic; sometimes with sparingly branched, woody caudices). |
Stems | 1–5, green throughout or purple-red-tinted distally to throughout, usually unbranched distally, ± hairy (often tomentose proximally). |
1(–3), green throughout or purple-red-tinted proximally, branched distally, ± hairy. |
Leaves | blades usually simple, rarely lobed (lobes 3), glabrous or ± hairy, eglandular or sparsely gland-dotted (basal leaf bases ± long-villous-woolly); mid leaves usually simple, rarely lobed (lobes 3, terminal lobes 1.5–3 mm wide). |
blades simple or lobed (lobes 3–17), glabrous or sparsely hairy, gland-dotted; mid leaves lobed (lobes 5–11, terminal lobes 0.8–2 mm wide). |
Peduncles | (1.5–)6–20(–29) cm, ± hairy, densely tomentose distally near involucres. |
2.5–7 cm, ± hairy. |
Involucres | hemispheric to broadly campanulate, 13–20 × 23–32 mm. |
campanulate, 8–10 × 9–12 mm. |
Ray florets | 13–15; corollas yellow, 13–26 × 5.4–9.5 mm. |
5–8; corollas yellow, 14–18 × 7–12 mm. |
Disc florets | 100–250+; corollas 5.7–7.4 mm. |
30–100+; corollas 3.5–4.3 mm. |
Phyllaries | in 2 series, unequal; outer 13–19, basally connate only slightly to 1/5 their lengths, lanceolate to narrowly lanceolate to obovate to oblanceolate, 7–11 mm, apices acuminate to acute; inner 13–18, narrowly lanceolate to oblanceolate, 8.5–12.6 mm, apices aristate. |
in 2 series, unequal; outer 5(–8), basally connate 1/3–1/2 their lengths, obovate to ovate, 6–7 mm, apices acuminate; inner 6–8, obovate, 6.5–8 mm, apices mucronate. |
Heads | 1–5 per plant, usually borne singly, sometimes in paniculiform arrays. |
5–50+ per plant, in paniculiform to corymbiform arrays. |
Cypselae | narrowly obpyramidal, 4.2–4.7 mm; pappi of 9–11(–15) obovate to oblanceolate, often aristate scales 4.7–7.3 mm. |
obpyramidal, 2.5–3.9 mm; pappi of 5–6 obovate, sometimes aristate, scales 1.2–2.5 mm. |
2n | = 30. |
= 30. |
Hymenoxys bigelovii |
Hymenoxys quinquesquamata |
|
Phenology | Flowering May–Jun. | Flowering (Jun–)Jul–Sep(–Oct). |
Habitat | Roadsides, edges of juniper-pine and pine forests | Open areas, edges of pine-oak forests |
Elevation | 1300–2500 m (4300–8200 ft) | 1500–2500 m (4900–8200 ft) |
Distribution |
AZ; NM
|
AZ |
Discussion | Hymenoxys quinquesquamata is known from southern Arizona, mostly Huachuca Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 21, p. 440. | FNA vol. 21, p. 441. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Hymenoxys | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Hymenoxys |
Sibling taxa | ||
Synonyms | Actinella bigelovii | |
Name authority | (A. Gray) K. F. Parker: Madroño 10: 159. (1950) | Rydberg: in N. L. Britton et al., N. Amer. Fl. 34: 114. (1915) |
Web links |