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praying snoutbean, rosary snoutbean

Habit Subshrubs.
Stems

sprawling or twining, gland-dotted, rarely viscid, villous or villosulous, hairs silvery or grayish and silvery intermixed.

Leaves

trifoliolate;

stipules early deciduous, ovate or lanceolate, 4–6 × 1.5–2 mm, apex acute or acuminate, surfaces villosulous;

petiole 1–7 mm, rarely viscid, villous or villosulous;

leaflet blades obovate to ovate-lanceolate or ovate-rhombic to rhombic, 20–130 × 15–100 mm, leathery, gland-dotted, base rounded to obtuse or cuneate, apex acute to acuminate, surfaces villous or villosulous abaxially, villous or villosulous adaxially, rarely glabrescent.

Inflorescences

racemes, longer than leaves, 5–30 cm.

Pedicels

1–2 mm.

Flowers

calyx 4–5 mm, villosulous, often viscid, tube 2–2.5 mm, lobes lanceolate, laterals 2–3 mm, lengths to 2.5 times tube, adaxials 1–1.5 mm;

corolla green-yellow, streaked purple or brown;

banner orbiculate, 8–9 × 6–7 mm, emarginate, villosulous, gland-dotted;

wings oblong, 6–7 × 2–2.5 mm, often gland-dotted, puberulent apically;

keel 6–8 × 3–3.5 mm, puberulent apically;

stamens 8–9 mm.

Legumes

brown or greenish, widely ovoid-oblong, subinflated, constricted, 20–30 × 7–12 mm, gland-dotted, rarely viscid, densely villosulous to puberulent.

Seeds

red and black, subglobose to ovoid, plump, 5–8 × 4–6 mm.

Rhynchosia precatoria

Phenology Flowering spring–summer.
Habitat Sandy soils or limestone, open areas, thickets, forests.
Elevation (0–20) or 600–1200 m. ((0–100) or 2000–3900 ft.)
Distribution
from FNA
AZ; FL; Central America; South America; Mexico (Baja California Sur, Chiapas, Chihuahua, Colima, Guerrero, Jalisco, México, Michoacán, Nayarit, Oaxaca, San Luis Potosí, Sonora, Veracruz)
[BONAP county map]
Discussion

Rhynchosia precatoria is native in Santa Cruz County, Arizona; it is considered introduced in Florida, where it is found in Miami-Dade County.

Glycine precatoria Humboldt & Bonpland ex Willdenow is a superfluous and illegitimate name that pertains here.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Rhynchosia
Sibling taxa
R. americana, R. cinerea, R. cytisoides, R. difformis, R. edulis, R. latifolia, R. michauxii, R. minima, R. parvifolia, R. reniformis, R. swartzii, R. texana, R. tomentosa
Synonyms Dolicholus vailiae, Indigofera volubilis, R. bicolor
Name authority de Candolle in A. P. de Candolle and A. L. P. P. de Candolle: Prodr. 2: 385. (1825)
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