Abrus
Abrus precatorius
abrus
crab's eye, jequirity bean, rosary pea
twining, pubescent becoming glabrescent.
to 50 cm.
alternate, even-pinnate;
stipules present;
petiolate;
leaflets 16–40, opposite, stipels absent or minute, blade margins entire, surfaces glabrous or pubescent.
4–10 cm;
stipules caducous, linear, 5 × 1 mm;
pinna blade oblong to elliptic, 5–30 × 3–10 mm, base obtuse, apex obtuse, usually terminated by bristle, surfaces sparsely pubescent abaxially, hairs appressed, minute, glabrous adaxially.
shorter than leaves.
10–30-flowered, axillary or terminal, racemes [pseudoracemes or fascicles];
bracts and bracteoles present.
papilionaceous;
calyx campanulate, lobes 5;
corolla pink or lavender to white, [yellowish, blue, or purplish];
stamens 9, vexillary stamen absent, connate 1/2 length;
anthers dorsifixed, uniform or 4 smaller;
ovary densely strigose;
style slightly curved, relatively short, glabrous;
stigma terminal, capitate, penicillate.
calyx subactinomorphic, 2–4 mm, sparsely pubescent;
corolla 9–12 mm, glabrous.
legumes, subsessile, slightly inflated [compressed], curved, oblong [linear], beaked, elastically dehiscent, puberulent.
(2–)3–4(–5) × 1–1.5 cm, smooth or muriculate; 2-valved, lightly septate.
(1–)3–7, subglobose [ellipsoid and compressed].
usually red with black spot surrounding hilum, sometimes black throughout, black and white, or whitish, 5–7 × 4–5 mm, lustrous;
hilum eccentric, elliptic, to 1 mm diam. 2n = 22.
, perennial, woody or suffrutescent, unarmed.
Abrus
Abrus precatorius
Species ca. 17 (1 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
B. Verdcourt (1970) pointed out that there are two entities, or subspecies, of Abrus precatorius: the typical subspecies, with smooth fruit surfaces, from Sri Lanka, India, and southeast Asia; and subsp. africanus Verdcourt from Africa, with muriculate fruit surfaces covered with low tubercles. There appear to be separate introductions to Florida, perhaps by way of the West Indies, as both subspecies and intermediates are to be found. Distinction of the two subspecies in the flora area is problematic.
The seeds are poisonous and importation of the species is prohibited in Canada (Canadian Food Inspection Agency, http://www.inspection.gc.ca/english/plaveg/oper/prohibintere.shtml). They have been used historically as standard weights in East Asia and are commonly used for rosaries and novelty jewelry (O. N. Allen and E. K. Allen 1981); this use is now prohibited in the United States (R. C. Dart 2004).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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