Amphicarpaea bracteata |
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American hog-peanut, hog-peanut |
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Stems | slender, filiform, mainly with whitish or pale hairs. |
Leaves | stipules lanceolate or ovate-lanceolate, 3.5–8.5 × 1–3 mm, in younger stems basally connate, sparsely strigillose; petiole 2.5–9.5(–17) cm, covered with retrorse hairs; rachis 1–1.5(–3.5) cm, covered with antrorse hairs; stipels narrowly triangular, relatively small; lateral leaflet blades asymmetrically ovate to broadly ovate, smaller than terminal; terminal blade broadly ovate to rhomboid-ovate, 3–10.5 × 1.6–8 cm, base rounded, apex acute, rarely with mucro. |
Peduncles | 2–6 cm, 6–12 floral nodes; bracts firm, widely ovate to truncate at apex, flabellate or bilobed, 2–5 × 1–3.5 mm, often silky-canescent. |
Flowers | chasmogamous with pedicels 2–5 mm; calyx 5–8 × 3 mm, cleistogamous 3 × 1 mm, lobes triangular to lanceolate, 1–2 mm; corolla becoming darker in age; banner obovate to suborbiculate, 13–15 × 4–5 mm; wings oblong, with claws 7 mm, auriculate above claws; keel similar to wings; ovary pubescent. |
Legumes | those of chasmogamous and cleistogamous aerial flowers oblong to slightly falcate, narrow at base and apex, 3–3.7 × 0.7 cm; valves strigose or glabrous, sutures with mostly ascending hairs or often at base with retrorse hairs. |
Seeds | 2 or 3(or 4) in chasmogamous and cleistogamous aerial fruits, dark red-brown, 3.5–4 × 3 mm; hilum reniform to broadly ovate, 1.5 mm; subterranean 1–1.5 cm diam. 2n = 22. |
Amphicarpaea bracteata |
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Phenology | Flowering Aug–Oct. |
Habitat | Rich, moist woodlands, edges of woods, along railroad tracks, sandy-loam roadsides, sand dunes. |
Elevation | 100–600 m. (300–2000 ft.) |
Distribution |
AL; AR; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NY; OH; OK; PA; RI; SC; SD; TN; TX; VA; VT; WI; WV; MB; NB; NL; NS; ON; PE; QC; SK; Mexico (Nuevo León, Puebla)
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Discussion | Several local or regional floras have treated Amphicarpaea bracteata as comprising two varieties, var. bracteata and var. comosa. The latter is characterized by having stout stems, often densely covered with brownish hirsute-villous hairs, calyx 1 cm, corolla mostly purple, ca. 15 mm, keel petal blades equaling claws, aerial legumes with strigose valves, pubescence of the adaxial (placentar) suture with ascending (antrorse) hairs, and the abaxial suture with retrorse hairs proximally. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Amphicarpaea |
Synonyms | Glycine bracteata, A. bracteata var. comosa, A. bracteata var. pitcheri, A. chamaecaulis, A. ciliata, A. monoica, A. monoica var. comosa, A. pitcheri, Falcata bracteata, F. comosa, F. pitcheri, G. comosa, Phaseolus pitcheri |
Name authority | (Linnaeus) Fernald: Rhodora 35: 276. (1933) — (as Amphicarpa) |
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