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Pleiacanthus
Family:
Asteraceae
Max Licher
FNA
Resources
L. D. Gottlieb in Flora of North America (vol. 19, 20 and 21)
Perennials,
10-50 cm; root crowns woody, branched.
Stems
1-4[-8]. branches divaricate, rigid, spine-tipped, with conspicuous tufts of light brown, wool in axils of bud scales at and just below ground level, otherwise glabrous (bud scales lanceolate, 8-30 × 5-8 mm, entire).
Leaves
cauline; sessile; proximal blades linear, margins entire; distal bractlike.
Heads
(± subsessile, erect), borne singly or in paniculiform arrays.
Peduncles
not inflated, not bracteate.
Calyculi
of 4-6 bractlets (unequal, lengths to
1
/2 phyllaries).
Involucres
cylindric. 2-3+ mm diam.
Phyllaries
3-5 in ±1 series, linear-lanceolate.
Receptacles
flat or convex. smooth, glabrous, epaleate.
Florets
3-5; corollas pink or lavender.
Cypselae
tan, columnar, apices truncate (beaks 0), with 5 equal faces. separated by weakly rounded ribs, each face with central. narrow, shallow, longitudinal groove, glabrous;
pappi
persistent, of 50-60, distinct, light tan, barbellate bristles (of 2 lengths).
x
= 8.
Species within checklist:
Sunset Crater Volcano National Monument
Pleiacanthus spinosus
Map not
Available
This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].
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