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(Last Modified On 9/27/2013)
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(Last Modified On 9/27/2013)
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Species
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Eriosema diffusum (H.B.K.) G. Don
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PlaceOfPublication
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Gen. Hist. 2: 347. 1832.
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Synonym
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Glycine diffusa H.B.K., Nov. Gen. Sp. P1. 6: 420. 1823. TYPE: Colombia, "prope fluvium Putes, prov. Popayanensium" not seen. Rhynchosia diffusa (H.B.K.) DC., Prodr. 2: 388. 1825. Rhynchosia diffusa var. oblongifolia DC., Prodr. 2: 388. 1825. TYPE: not seen. Eriosema diffusa var. oblongifolia (DC.) G. Don, Gen. Hist. 2: 347. 1832. Eriosema diffusa var. holosericeum Seem., Bot. Voy. Herald 110. 1853. TYPE: Panama, Volcano of Chiriqui, Seemann, not seen.
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Description
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Erect herb or subshrub, the stems ascending from a woody base, terete, densely sericeous. Leaves trifoliolate, the leaflets oblanceolate to obovate, 2.5- 4.7 cm long, 0.8-1.2 cm wide, apically acuminate, basally cuneate, the margins revolute, pubescence strigose above, tomentose silvery beneath, especially along the veins, the terminal leaflet longer than the laterals, the petioles 1.0-2.0 mm long, densely white sericeous; stipules lanceolate, connate to occasionally split- ting, 0.6-1.0 cm long, 0.3-5.0 cm wide, externally strigose. Inflorescence 1.5-3.8 cm long, not exceeding the leaflets; flowers 5-10 per cluster; peduncles 1.8-3.0 mm long, 1.0-1.5 mm wide; pedicels 0.3-0.5 cm long; bracts subtending the flowers lanceolate, caducous, 2.0-4.0 mm long, 1.0-1.5 mm wide. Flowers with the calyx 3.0-4.0 mm long, the tube 1.0-1.5 mm long, externally pubescent, gland dotted; corolla yellow, 7.0-8.0 mm long, the standard ovate, 8.0-9.0 mm long, 4.0-4.5 mm wide, auriculate at the base, the wings oblong, 0.6-0.7 cm long, the claw 0.2 mm long, the keel falcate, 0.6-0.7 cm long, the stamens 0.7 cm long. Fruit ovate, 0.9-1.1 cm long, 0.5-0.7 cm wide, brown strigose; seeds ovoid, 3.0- 3.3 mm long, 1.5-2.0 mm wide, black or mottled.
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Habit
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herb or subshrub
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Distribution
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ranges from Mexico to northern Colombia
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Note
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occurring on savannas and grassy banks near streams. In Chiriqui, Panama, it occurs on lava fields. Eriosema diffusum is recognized by the silvery pubescence of the under- side of the leaves. Seemann described E. diffusum var. holosericeum based on plants collected in Chiriqui, which have copious pubescence on both the upper and lower leaflet surface. However, this single character difference does not seem to warrant segregation of a variety (Grear, 1970).
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Specimen
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CHIRIQUI: Near Volcan, 1300 m, Burt & Koster 156 (MO). Boquete, 3800 ft, Davidson 728 (GH, MO, US). Near Volcan, 4600 ft, Duke 9181 (MO, OS), 9204 (NY, MO); Ebinger 763 (MO). 1/2 mi S of Bambito on lava flow, 1600 m, Lazor & Correa 2710 (FSU, MO, SCZ); Partch 69-28 (MO). Forest near Boquete, 1000-1300 m, Pittier 2945 (GH, MO, NY). Llanos del Volcan, 1120-1500 m Siebert 340 (MO); Tyson 5748 (FSU), 5858 (FSU, MO, SCZ). Rio Chiriqui Viejo valley, White 85 (GH, MO, US). Near El Hato del Volcan, Wilbur et al. 17194 (MO), 11934 (F, MO, NY). PANAMA: Road between Panama and Chepo, Dodge 16634 (GH, MO). Pacora, Paul 268 (US). Penonome, 50-1000 ft, Williams 582 (US, NY). VERAGUAS: 18 km S of Santa Fe on Santiago road, 400 m, Nee 8173 (MO).
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