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Photo is of parent taxon

desert leatherweed, leatherweed

leatherweed, leatherweed croton

Habit Herbs, perennial, 1–6 dm, monoecious or dioecious.
Stems

somewhat zigzag;

erect radii of stellate hairs longer than lateral radii, thus pubescence appearing ± shaggy.

several from base, sparsely branched distally, stellate-hairy.

Leaves

blades usually 1–1.4 cm.

sometimes clustered near inflorescences;

stipules rudimentary;

petiole 0.5–2 cm, glands absent at apex;

blade ovate-oblong, proximal rounder, distal more ovate-elliptic, 1–6 × 1–3 cm, base rounded, margins entire, apex rounded to acute, both surfaces pale to ashy green, softly stellate-hairy.

Racemes

mostly 0.5–0.9 cm.

Inflorescences

bisexual or unisexual, racemes, 0.5–2.5 cm, staminate and pistillate flowers each (12–)20–25.

Pedicels

staminate 1.5–6 mm, pistillate 1–3.5 mm, ± recurved in fruit.

Staminate flowers

sepals (4–)5, 1–1.5 mm, abaxial surface densely stellate-hairy;

petals (4–)5, oblong-lanceolate, 1–1.3 mm, abaxial surface glabrous except margins villous;

stamens 10–15.

Pistillate flowers

sepals 5, equal, 1.5–3 mm, margins entire, apex straight to slightly incurved, abaxial surface glabrous except stellate-hairy at apex;

petals 0;

ovary 3-locular;

styles 3, 0.5–4.5 mm, 2-fid to base, terminal segments 6.

Styles

usually 0.5–1 mm.

Capsules

4 mm.

4–6(–7) × 4–5 mm, smooth;

columella apex with 3 sharp projections.

Seeds

3.5–4 × 2–2.5 mm, shiny.

2n

= 20.

Croton pottsii var. thermophilus

Croton pottsii

Phenology Flowering Jul–Oct.
Habitat Basalt and limestone hills.
Elevation 700–1800 m. (2300–5900 ft.)
Distribution
from FNA
TX; Mexico (Coahuila)
[BONAP county map]
from FNA
AZ; NM; TX; n Mexico; c Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Variety thermophilus is restricted to Brewster County and nearby Mexico.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Varieties 2 (2 in the flora).

The affinities of Croton pottsii lie with C. lindheimerianus and C. monanthogynus.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Stems straight; erect radii of stellate hairs shorter than lateral radii, thus pubescence appearing appressed and smooth; leaf blades 1.6–6 cm; racemes mostly 1.1–2.5 cm; styles 1.1–4.5 mm; capsules 4–6(–7) mm.
var. pottsii
1. Stems somewhat zigzag; erect radii of stellate hairs longer than lateral radii, thus pubescence appearing ± shaggy; leaf blades usually 1–1.4 cm; racemes mostly 0.5–0.9 cm; styles usually 0.5–1 mm; capsules 4 mm.
var. thermophilus
Source FNA vol. 12, p. 222. FNA vol. 12, p. 221.
Parent taxa Euphorbiaceae > Croton > Croton pottsii Euphorbiaceae > Croton
Sibling taxa
C. pottsii var. pottsii
C. alabamensis, C. argenteus, C. argyranthemus, C. californicus, C. capitatus, C. ciliatoglandulifer, C. cortesianus, C. coryi, C. dioicus, C. elliottii, C. fruticulosus, C. glandulosus, C. heptalon, C. humilis, C. incanus, C. leucophyllus, C. lindheimeri, C. lindheimerianus, C. linearis, C. michauxii, C. monanthogynus, C. parksii, C. punctatus, C. sancti-lazari, C. setigerus, C. soliman, C. sonorae, C. suaveolens, C. texensis, C. wigginsii
Subordinate taxa
C. pottsii var. pottsii, C. pottsii var. thermophilus
Synonyms C. corymbulosus var. thermophilus, C. thermophilus Lasiogyne pottsii
Name authority (M. C. Johnston) M. C. Johnston: SouthW. Naturalist 5: 171. (1960) (Klotzsch) Müller Arg.: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 15(2): 561. (1866)
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