Flora of North America species comparison

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Croton sancti-lazari

trans-Pecos croton
Habit Shrubs, 1–4 dm, dioecious.
Stems

much branched proximally, coarsely stellate-tomentose.
Leaves

not clustered;

stipules each 1 glandular papilla, 0.1 mm;

petiole 0.1–0.4(–0.6) cm, 1/10–1/5 blade length, glands absent at apex;

blade ovate to elliptic-ovate, 1–3(–4.5) × 0.5–1.5(–2) cm, base usually rounded to obtuse, rarely acute, margins entire, apex acute or rounded, abaxial surface pale green to pale yellow, stellate-tomentose, adaxial surface darker green, stellate-tomentose.
Inflorescences

unisexual;

staminate racemes, 1–3.3 cm, flowers 1–8;

pistillate congested racemes, 0.1–0.3 cm, flowers 1–3.
Pedicels

staminate 1 mm, pistillate 0–0.5 mm.
Staminate flowers

sepals (4–)5, 2 mm, abaxial surface stellate-hairy;

petals (4–)5, narrowly oblanceolate, 1.8–2 mm, abaxial surface nearly glabrous;

stamens 9–12.
Pistillate flowers

sepals 5, equal, 1 mm, margins entire, apex straight to slightly incurved, abaxial surface stellate-hairy;

petals 0 or rudimentary;

ovary 3-locular;

styles 3, 1.5–2 mm, 2-fid to base, terminal segments 6.
Capsules

4–5 × 5.5–6 mm, smooth;

columella apex with 3 rounded, inflated lobes.
Seeds

3.6–4.7 × 2.8–3.4 mm, shiny.

Croton sancti-lazari
Phenology Flowering Oct–Nov.
Habitat Rocky hillsides.
Elevation 900–1200 m. (3000–3900 ft.)
Distribution
from FNA
TX; Mexico (Chihuahua, Coahuila)
[BONAP county map]
Discussion

Croton sancti-lazari in the flora area grows only in Brewster and Presidio counties.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 12, p. 222.
Parent taxa Euphorbiaceae > Croton
Sibling taxa
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. pottsii, C. punctatus, C. setigerus, C. soliman, C. sonorae, C. suaveolens, C. texensis, C. wigginsii
Synonyms C. abruptus
Name authority Croizat: J. Arnold Arbor. 26: 185. (1945)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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