Jatropha curcas |
Jatropha cuneata |
|
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Barbados nut, physic nut, piñón, purging nut |
leatherplant, limberbush, physicnut, sangre de drago |
|
Habit | Trees, to 10[–15] m, monoecious. | Shrubs, to 2 m, dioecious. |
Stems | erect, gray-green, much-branched, woody-succulent, glabrous; short shoots absent; latex watery, colorless in younger branches, cloudy-whitish in older shoots. |
spreading, yellow to yellow-brown [gray], much-branched, woody-succulent, glabrous; short shoots common; latex watery, yellow in young shoots, red in older shoots. |
Leaves | persistent, ± evenly distributed on long shoots; stipules caducous, narrowly lanceolate, 5 mm, undivided; petiole 9–19 cm, not stipitate-glandular; blade round in outline, 9–15 × 9–15 cm, usually shallowly 3–5-lobed, rarely unlobed, base cordate, margins entire or glandular (young leaves), apex acuminate, membranous, surfaces glabrous; venation palmate. |
deciduous, usually fascicled on short shoots; stipules absent; petiole 0(–0.2) cm, not stipitate-glandular; blade obovate-spatulate, 0.7–1.9 × 0.3–0.9 cm, unlobed (shallowly 3-lobed on active shoots), base attenuate, margins entire, apex usually rounded, sometimes emarginate, coriaceous, surfaces glabrous; venation pinnate (palmate if lobed). |
Inflorescences | bisexual, terminal and subterminal, cymes; peduncle 5–10 cm; bracts 3–10 mm, margins entire, glabrous. |
on short shoots, cymes or flowers solitary; peduncle 0.4–0.6 cm; bracts 0.4–1 mm, margins entire, glabrous. |
Pedicels | 1–3 mm. |
1–4(–6.5) mm. |
Staminate flowers | sepals distinct, ovate-elliptic, 4–6 × 2–3 mm, margins entire, apex acute, surfaces glabrous; corolla greenish yellow, campanulate, petals distinct or connate 1/4 length, 6–8 × 2–3.5 mm, glabrous abaxially, tomentose adaxially; stamens 10, ± in 2 whorls (5 + 5); filaments of both whorl connate to top or nearly so, outer whorl 3–4.5 mm, inner whorl 3–5 mm. |
sepals connate basally, ovate-lanceolate, 2.5–4 × 0.6–1 mm, margins entire, apex acute, surfaces glabrous; corolla white, tubular-urceolate, petals connate most of length, 4–6 × 1.3–2 mm, surfaces glabrous; stamens 10 in 2 whorls (5 + 5); filaments of both whorls connate almost to top, outer whorl 1–2.5 mm, inner series 2.5–4 mm. |
Pistillate flowers | resembling staminate, but sepals connate to 1/2 length, 5–7.5 × 2–5 mm; petals 4–5 × 2–2.5(–3) mm; staminodes infrequent; carpels 3; styles connate most of length, 0.5–1.5 mm. |
resembling staminate, but sepals distinct, 1.5–3 × 0.5–1 mm; petals 4–4.5 × 1–1.5 mm; carpel 1; styles 0.5–1 mm. |
Capsules | ellipsoidal, 2.6–3 × 2.2–2.8 cm, drupaceous. |
spheric, 0.9–1.1 × 0.9–1.1 cm, tardily dehiscent. |
Seeds | black or black mottled with white spots, ellipsoidal, 18–20 × 11–13 mm; caruncle rudimentary. |
solid dark to golden brown, spheric, 10 × 10 mm; caruncle absent. |
2n | = 22 (Puerto Rico). |
= 44 (Mexico). |
Jatropha curcas |
Jatropha cuneata |
|
Phenology | Flowering and fruiting spring (late summer–early fall). | Flowering and fruiting late spring–summer. |
Habitat | Disturbed sites. | Dry rocky limestone mesas, sandy areas, bajadas. |
Elevation | 0–50 m. (0–200 ft.) | 0–800 m. (0–2600 ft.) |
Distribution |
FL; Mexico; Central America [Introduced in North America; introduced also in West Indies, South America, Asia, Africa, Pacific Islands, Australia]
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AZ; Mexico (Baja California, Baja California Sur, Sonora)
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Discussion | Jatropha curcas now has a circumtropical distribution but probably originated in Central America; it is naturalized in southern Florida. The latex of J. curcas is used for soap making and for medicinal purposes; the seeds are used for biofuel production. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
In Arizona, Jatropha cuneata is found only in Pima County, primarily in Organ Pipe Cactus National Monument and Cabeza Prieta National Wildlife Refuge. Its stems have been used in basket making. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 202. | FNA vol. 12, p. 203. |
Parent taxa | Euphorbiaceae > Jatropha | Euphorbiaceae > Jatropha |
Sibling taxa | ||
Name authority | Linnaeus: Sp. Pl. 2: 1006. (1753) | Wiggins & Rollins: Contr. Dudley Herb. 3: 272, plate 62, fig. 1. (1943) |
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