Croton cortesianus |
Croton michauxii |
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Cortez's croton, palillo |
Michaux's croton, narrowleaf rushfoil, rushfoil |
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Habit | Shrubs, 10–30 dm, dioecious. | Herbs, annual, 1–9 dm, monoecious. | ||||
Stems | di- or trichotomously branched, stellate-hairy, young stems often blackened by fungus. |
usually single from base, much branched from near middle, densely stellate-lepidote appearing silvery. |
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Leaves | not clustered; stipules rudimentary; petiole 1–1.5 cm, 1/6–1/3 leaf blade length, glands absent at apex; blade narrowly obovate, oblong, elliptic, or lanceolate, 3–10 × 1–5 cm, mostly less than 3.5 times as long as wide, base subacute to rounded, margins minutely denticulate, apex acute or acuminate, abaxial surface light green, densely ochraceous stellate-hispid when young, pale stellate-hairy when mature, adaxial surface darker green, glabrous. |
not clustered; stipules rudimentary; petiole 0.1–0.5 cm, glands absent at apex; blade lanceolate-linear to ovate-lanceolate, 1.5–4 × 0.1–0.4(–1.5) cm, base acute to cuneate, margins entire, apex acute, abaxial surface silvery, stellate-lepidote, adaxial surface green, sparsely stellate-hairy, hairs with few radii. |
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Inflorescences | unisexual, racemes; staminate 7–20 cm, flowers 10–30; pistillate 1–5 cm, flowers 8–20(–30). |
bisexual, spikes, 0.3–3 cm, staminate flowers 1–12, pistillate flowers 1–6. |
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Pedicels | staminate 0–1 mm, pistillate 0–0.5 mm. |
pistillate absent, staminate 0–1 mm. |
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Staminate flowers | sepals 5, 2.5 mm, abaxial surface stellate-hairy; petals 5, oblong, 3 mm, abaxial surface glabrous except margins ciliate basally; stamens 12–16. |
sepals 5, 1 mm, abaxial surface lepidote; petals 5, spatulate, 0.6–1 mm, abaxial surface glabrous except margins villous; stamens 5–7. |
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Pistillate flowers | sepals 5, equal, 1–1.5 mm, margins entire, apex straight to slightly incurved, abaxial surface stellate-hispid; petals rudimentary; ovary 3-locular; styles 3, 4–5 mm, 2-fid, terminal segments 6. |
sepals (4–)5, equal, 1–1.5 mm, margins entire, apex straight, abaxial surface lepidote; petals 0; ovary 1-locular; styles 3, 0.5–0.8 mm, minutely 2-fid, terminal segments 3 or 6. |
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Capsules | 5–6 × 4.5–5.5 mm, smooth; columella apex with 3 rounded, inflated lobes. |
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Achenes | 2.5–3 × 1–1.2 mm, smooth; columella absent. |
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Seeds | 4–5 × 3–3.5 mm, shiny (with silvery sheen). |
2–2.5 × 1 mm, surface not visible because seed coat adherent to fruit wall. |
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2n | = 20. |
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Croton cortesianus |
Croton michauxii |
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Phenology | Flowering Feb–Oct, possibly year-round. | |||||
Habitat | Scrub forests. | |||||
Elevation | 0–50 m. (0–200 ft.) | |||||
Distribution |
TX; e Mexico; se Mexico; Central America |
AL; AR; CT; DE; FL; GA; IA; IL; IN; KS; KY; LA; MD; MO; MS; NC; NJ; OK; PA; SC; TN; TX; VA
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Discussion | Croton cortesianus is known in the flora area only from Cameron, Hidalgo, and Starr counties. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 12, p. 213. | FNA vol. 12, p. 220. | ||||
Parent taxa | ||||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | C. chichenensis, C. trichocarpus | Crotonopsis linearis | ||||
Name authority | Kunth: in A. von Humboldt et al., Nov. Gen. Sp. 2(fol.): 66; 2(qto.): 83. (1817) | G. L. Webster: Novon 2: 270. (1992) | ||||
Web links |