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Eve's necklace, Eve's necklacepod

Habit Trees or shrubs, to 10 m.
Leaves

stipules linear, 2 mm;

petiole 1.8–2.5 cm, sparsely to moderately pubescent, hairs antrorse-appressed, translucent to white;

leaflets (9–)13–19, petiolules 1–2 mm, blades narrow to broadly elliptic or obovate, (0.6–)1–3.7(–4.5) × (0.3–)0.6–1.7(–2) cm, apex obtuse to rounded, mucronate, surfaces evenly sparsely to densely pubescent abaxially, glabrous or glabrate adaxially.

Inflorescences

axillary, racemes, axis moderately to densely pubescent, hairs antrorse-appressed, translucent to white;

axis (2–)7–10 cm;

bracts linear, 0.5–1.2 mm;

bracteoles linear, 0.5–2 mm.

Pedicels

5–20 mm, densely pubescent, hairs antrorse-appressed, translucent to white.

Flowers

calyx 2.5–5 mm, moderately to densely pubescent, lobes broadly rounded;

corolla white to yellow, pink, or purple, 1–1.4 cm;

ovary densely sericeous.

Legumes

3–5(–15) × 0.8–1 cm;

stipe 10–20 mm.

Seeds

1–4(–8), 5.2–7 × 4–5 mm.

2n

= 28.

Styphnolobium affine

Phenology Flowering Mar–May.
Habitat Woodlands, floodplains, stream margins, rocky uplands, roadsides.
Elevation 0–600 m. (0–2000 ft.)
Distribution
from FNA
AR; LA; OK; TX
[WildflowerSearch map]
[BONAP county map]
Discussion

The flowers of Styphnolobium affine are showy, and the persistent fruit resembles a black string of pearls. It is cultivated as an ornamental within its native range. The seeds are reputed to be poisonous.

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

Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Styphnolobium
Sibling taxa
S. japonicum
Synonyms Sophora affinis
Name authority (Torrey & A. Gray) Walpers: Repert. Bot. Syst. 1: 807. (1843)
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