Croton argyranthemus |
Croton lindheimeri |
|
---|---|---|
healing croton, silver croton, silverleaf croton |
goatweed, Lindheimer's hogwort, woolly croton |
|
Habit | Herbs or subshrubs, annual or short-lived perennial, 1–6 dm, monoecious. | Herbs, annual, 5–20 dm, monoecious, stems, leaves, and buds with yellow-brown (ochraceous) pubescence when young, becoming glabrate. |
Stems | several from base, branching distally into 2–4 branches, lepidote. |
branching distally, stellate-hairy. |
Leaves | not clustered; stipules subulate, 0.2 mm; petiole 0.2–1(–2) cm, glands absent at apex; blade on proximal parts of stems oval to narrowly obovate, on distal parts oblong to lanceolate-oblong or broadly elliptic, 1–5 × 0.5–2(–3) cm, base rounded to narrowed, margins entire, apex obtuse to rounded, abaxial surface silvery, densely lepidote, adaxial surface darker green, sparsely lepidote or glabrate. |
not clustered; stipules linear, 0–5 mm; petiole 1.5–7 cm, glands absent at apex; blade ovate-lanceolate, 3–7 × 1–3 cm, base cordate to rounded or subcordate, margins entire, apex acute, abaxial surface pale green, not appearing brown-dotted, no stellate hairs with brown centers, densely stellate-hairy, adaxial surface greener, more sparsely hairy. |
Inflorescences | bisexual, racemes, 2–5 cm, staminate flowers 15–35, pistillate flowers 2–8. |
bisexual, racemes, 1.5–3 cm, staminate flowers 8–15, pistillate flowers 2–7. |
Pedicels | staminate 1–5 mm, pistillate 0–2 mm. |
staminate 0.5–3 mm, pistillate 0–1 mm. |
Staminate flowers | sepals 5, 5 mm, abaxial surface lepidote; petals 5, oblong-spatulate, 5 mm, abaxial surface densely lepidote, scales translucent, petals appearing hyaline; stamens 10–15. |
sepals (4–)5, 1.5–2 mm, abaxial surface stellate-hairy; petals 5, linear-oblong, 1–1.5 mm, abaxial surface stellate-hairy; stamens 9–13. |
Pistillate flowers | sepals 5–7, connate for 1/2+ length, equal, 3–4 mm, margins entire, apex incurved, abaxial surface lepidote; petals 0; ovary 3-locular; styles 3, 2–4 mm, 1–3 times 2-fid at apex, terminal segments 6–24. |
sepals 7–8, equal, 5–7 mm, margins entire, apex straight to slightly incurved, abaxial surface yellowish woolly-tomentose; petals 0; ovary 3-locular; styles 3, 3–4 mm, 2 times 2-fid, terminal segments 12. |
Capsules | 5–6 × 3–4 mm, smooth; columella 3-angled. |
6–8 × 8–9 mm, smooth; columella tipped with 3-pronged grappling hooklike appendage. |
Seeds | 4–5 × 2.5–3 mm, dull. |
4–5 × 4–4.5 mm, shiny. |
2n | = 20. |
|
Croton argyranthemus |
Croton lindheimeri |
|
Phenology | Flowering Mar–Sep. | Flowering May–Dec. |
Habitat | Deep sandy soils in pinelands, pine-oak scrub, sandhills. | Old pastures, forest openings, bottomlands, fence rows, disturbed areas. |
Elevation | 0–200 m. (0–700 ft.) | 0–300 m. (0–1000 ft.) |
Distribution |
AL; FL; GA; LA; MS; TX; Mexico (Nuevo León, Tamaulipas)
|
AL; AR; FL; GA; LA; MO; MS; SC; TN; TX
|
Discussion | Croton argyranthemus is closely related to C. coryi. Although they have very different kinds of vegetative indumentum, the staminate petals are characteristically silvery-lepidote in both species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Croton lindheimeri is very similar to C. capitatus, and the two can sometimes be found growing together in northeastern Texas. Croton lindheimeri can be distinguished by its more ochraceous pubescence on young growth, consistently acute leaf tips, somewhat more elongated pistillate part of the raceme, and pistillate sepal tips that do not recurve after anthesis. Croton lindheimeri was reported from Indiana, adventive on ballast in 1898, and from Kansas based on a single 1883 collection from Miami County, but apparently did not become established in either state. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 211. | FNA vol. 12, p. 218. |
Parent taxa | Euphorbiaceae > Croton | Euphorbiaceae > Croton |
Sibling taxa | ||
Synonyms | Pilinophytum lindheimeri, C. capitatus var. lindheimeri | |
Name authority | Michaux: Fl. Bor.-Amer. 2: 215. (1803) — (as argyranthemum) | (Engelmann & A. Gray) Alph. Wood: Class-book Bot. ed. s.n.(b), 631. (1861) |
Web links |