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FNA | Family List | FNA Vol. 12 | Euphorbiaceae

12. Croton glandulosus Linnaeus, Syst. Nat. ed. 10. 2, 1275. 1759. (as glandulosum).

Sand or tooth-leaved or tropic croton, vente conmigo Sand or tooth-leaved or tropic croton, vente conmigo

Decarinium glandulosum (Linnaeus) Rafinesque; Geiseleria glandulosa (Linnaeus) Klotzsch; Oxydectes glandulosa (Linnaeus) Kuntze

Herbs, annual, 1–12 dm, monoecious. Stems much branched distally, usually coarsely stellate-hairy, rarely glabrescent. Leaves not clustered; stipules linear-subulate, glandular or not, to 0.5 mm or absent; petiole 0.2–1 cm, glands at apex 2, yellow, sessile to shortly stipitate, cuplike; blade ovate proximally, oblong-lanceolate distally, 0.6–3.5(–7) × 0.3–1.5(–3) cm, base obtuse to truncate, margins coarsely crenate to serrate-dentate, apex obtuse to rounded, both surfaces green, stellate-hairy, glabrate, or rarely glabrous. Inflorescences bisexual, racemes, 1–3 cm, staminate flowers 10–20, pistillate flowers 1–4. Pedicels: staminate 0.8–2 mm, pistillate 0–5 mm. Staminate flowers: sepals 5, 0.8–1.2 mm, abaxial surface stellate-hairy; petals 5, oblanceolate, 1–1.3 mm, abaxial surface glabrous except margins ciliate; stamens 7–13. Pistillate flowers: sepals 5, subequal, 6–7.5 mm, margins entire, apex straight to slightly incurved, abaxial surface glabrous except stellate-hairy apically; petals 0 or 5, rudimentary; ovary 3-locular; styles 3, 1–2.5 mm, deeply 2-fid, terminal segments 6. Capsules 3.5–6 × 4–5 mm, smooth; columella 3-angled. Seeds 3–4 × 2–2.5 mm, shiny. 2n = 16.

Varieties ca. 20 (5 in the flora): United States, Mexico, West Indies, Central America, South America.

Croton glandulosus is widespread in the New World, with a complex pattern of variation. The classification here follows B. W. van Ee et al. (2009).

1 Leaf blades glabrate or sparsely to moderately stellate-hairy   (2)
+ Leaf blades moderately to densely stellate-hairy   (4)
2 (1) Plants 2–12 dm; leaf blades 2–7 cm.   12e Croton glandulosus var. septentrionalis (in part)
+ Plants 1–2 dm; leaf blades 0.6–2(–3) cm   (3)
3 (2) Leaf blades glabrate, bases markedly 3-veined; petiole apical glands sessile; Florida.   12b Croton glandulosus var. floridanus
+ Leaf blades sparsely stellate-hairy, bases obscurely 3-veined; petiole apical glands stipitate; Kansas, New Mexico, Oklahoma, Texas.   12c Croton glandulosus var. lindheimeri (in part)
4 (1) Leaf blades firm-thick, length mostly 2 times width or less, marginal teeth rounded; petiole apical glands sessile.   12a Croton glandulosus var. arenicola
+ Leaf blades membranous, length mostly more than 2 times width, marginal teeth pointed; petiole apical glands sessile or stipitate   (5)
5 (4) Leaf blades 1–2(–3) × 0.3–0.8(–1.3) cm; petiole apical glands stipitate, circular when dry, 0.1–0.4 mm diam.   12c Croton glandulosus var. lindheimeri (in part)
+ Leaf blades 2–7 × 0.7–3 cm; petiole apical glands sessile, wavy-wrinkled when dry, 0.5–0.8 mm diam   (6)
6 (5) Stems densely stellate-hairy, hairs spreading, radii unequal; leaf blades densely stellate-villous.   12d Croton glandulosus var. pubentissimus
+ Stems moderately stellate-hairy, hairs appressed, radii equal; leaf blades moderately stellate-hairy.   12e Croton glandulosus var. septentrionalis (in part)

Lower Taxa


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