Croton sancti-lazari |
Croton sonorae |
|
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trans-Pecos croton |
Sonora croton, Sonoran croton |
|
Habit | Shrubs, 1–4 dm, dioecious. | Shrubs, 8–16 dm, monoecious. |
Stems | much branched proximally, coarsely stellate-tomentose. |
much-branched distally, canescent when young, becoming glabrate. |
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. |
sometimes clustered near inflorescences; stipules subulate, to 1 mm; petiole 0.4–1 cm, 1/4–1/2 leaf blade length, glands absent at apex; blade ovate to broadly lanceolate, 0.8–4 × 0.6–2 cm, base cuneate to rounded or cordate, margins entire, not undulate, ciliate-glandular, apex acute to acuminate, abaxial surface pale green, sparsely whitish stellate-hairy, adaxial surface darker green, glabrate. |
Inflorescences | unisexual; staminate racemes, 1–3.3 cm, flowers 1–8; pistillate congested racemes, 0.1–0.3 cm, flowers 1–3. |
bisexual or staminate, racemes, 2–14 cm, staminate flowers 10–25, pistillate flowers 3–5(–8). |
Pedicels | staminate 1 mm, pistillate 0–0.5 mm. |
staminate 1–1.5 mm, pistillate 1–4 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. |
sepals 5, 1–1.5 mm, abaxial surface sparsely stellate-hairy; petals 5, lanceolate, 1.5–2 mm, abaxial surface glabrous except margins villous; stamens 13–16. |
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. |
sepals 5, equal, 1.5–2 mm, margins entire, apex incurved, abaxial surface sparsely stellate-hairy; petals papillae, 0.5 mm; ovary 3-locular; styles 3, 2–3 mm, 2-fid, terminal segments 6. |
Capsules | 4–5 × 5.5–6 mm, smooth; columella apex with 3 rounded, inflated lobes. |
7–8 × 5–6 mm, smooth; columella apex with 3 rounded, inflated lobes. |
Seeds | 3.6–4.7 × 2.8–3.4 mm, shiny. |
6–7 × 3–4 mm, shiny. |
Croton sancti-lazari |
Croton sonorae |
|
Phenology | Flowering Oct–Nov. | Flowering Jul–Sep. |
Habitat | Rocky hillsides. | Rocky slopes, desert scrub. |
Elevation | 900–1200 m. (3000–3900 ft.) | 500–1100 m. (1600–3600 ft.) |
Distribution |
TX; Mexico (Chihuahua, Coahuila) |
AZ; Mexico (Baja California, Sonora)
|
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.) |
Croton sonorae is widely distributed in Mexico and extends into southern Arizona in Maricopa, Pima, and Pinal counties. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 222. | FNA vol. 12, p. 223. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | C. abruptus | C. attenuatus, C. pringlei |
Name authority | Croizat: J. Arnold Arbor. 26: 185. (1945) | Torrey: in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 194. (1859) |
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