Palafoxia arida |
Palafoxia hookeriana |
|
---|---|---|
desert palafox, Spanish needle |
sand palafox |
|
Habit | Annuals, 10–200 cm. | Annuals, 25–180 cm. |
Stems | scabrous to nearly glabrous, sometimes distally stipitate-glandular. |
usually stipitate-glandular throughout. |
Leaf | blades lance-linear to linear, 20–120 × 2–55 mm. |
blades broadly to narrowly lanceolate, 50–100 × 3–25 mm. |
Involucres | cylindric to narrowly turbinate. |
broadly turbinate. |
Ray florets | 0. |
5–13; corollas 10–20 mm, laminae 9–14 mm. |
Disc florets | 9–40; corollas ± actinomorphic, 9–13 mm, throats ± cylindric, longer than lobes. |
25–90; corollas ± actinomorphic, 10–12 mm, throats ± funnelform, shorter than lobes. |
Phyllaries | ± equal, 10–25 × 1–2.5 mm, ± scabrous, sometimes stipitate-glandular. |
7–16+ × 3–5 mm, ± equal, scabrous and/or stipitate-glandular. |
Cypselae | 10–16 mm; pappus scales of inner cypselae 8–12 mm. |
6–9 mm; pappus scales of inner cypselae 5–8 mm. |
2n | = 24. |
= 24. |
Palafoxia arida |
Palafoxia hookeriana |
|
Phenology | Flowering late winter–spring(–summer). | Flowering late summer–fall. |
Habitat | Sandy soils | Sandy soils |
Elevation | 30–1000 m (100–3300 ft) | 10–200+ m (0–700+ ft) |
Distribution |
AZ; CA; NV; UT; Mexico (Baja California, Sonora)
|
TX |
Discussion | Plants of Palafoxia arida 90–150 cm with phyllaries 16–25 mm (from dunes west of Yuma, Arizona) have been treated as var. gigantea. Plants referable to P. arida have been named P. linearis (Cavanilles) Lagasca (including var. gigantea M. E. Jones) in other floras; P. linearis is a Mexican species (see B. L. Turner and M. I. Morris 1976). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Plants of Palafoxia hookeriana with stems stipitate-glandular distally (versus throughout), phyllaries 7–12 (versus 10–16) mm, and florets 25–50 (versus 50–90) per head have been treated as var. minor Shinners. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 390. | FNA vol. 21, p. 389. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Palafoxia | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Palafoxia |
Sibling taxa | ||
Synonyms | P. arida var. gigantea | |
Name authority | B. L. Turner & M. I. Morris: Madroño 23: 79. (1975) | Torrey & A. Gray: Fl. N. Amer. 2: 368. (1842) |
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