Palafoxia arida
Palafoxia riograndensis
desert palafox, Spanish needle
Rio Grande palafox
scabrous to nearly glabrous, sometimes distally stipitate-glandular.
scabrous to glabrate, not stipitate-glandular.
blades lance-linear to linear, 20–120 × 2–55 mm.
blades lance-linear, 30–70 × 2–8 mm.
cylindric to narrowly turbinate.
± cylindric.
0.
0.
9–40;
corollas ± actinomorphic, 9–13 mm, throats ± cylindric, longer than lobes.
8–25;
corollas zygomorphic (outer) to actinomorphic (inner), 6–9 mm, throats ± funnelform, shorter than lobes.
± equal, 10–25 × 1–2.5 mm, ± scabrous, sometimes stipitate-glandular.
10–15 × 1–2 mm, ± equal, ± scabrous, not stipitate-glandular.
10–16 mm;
pappus scales of inner cypselae 8–12 mm.
7–12 mm;
pappus scales of inner cypselae 5–8 mm.
= 24.
= 24.
Palafoxia arida
Palafoxia riograndensis
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.)
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