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(Last Modified On 10/1/2013)
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(Last Modified On 10/1/2013)
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Species
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Stylosanthes humilis H.B.K.
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PlaceOfPublication
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Nov. Gen. Sp. P1. 6: 506. 1823.
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Note
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TYPE: Venezuela, Humboldt & Bonpland, not seen. Non S. humilis Rich. ex Hemsl.
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Synonym
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Astyposanthes humilis (H.B.K.) Herter, Revista Sudamer. Bot. 7: 209. 1943.
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Description
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Herbs, often suffruticose; stems ascending to prostrate, to 0.5 m tall, branched, puberulent to hirsute. Leaflets lanceolate to elliptic, mucronate, acute, the adaxial surface and the margins sparsely setose to glabrous, 3-4 pairs of conspicuous nerves; terminal leaflet 5-15(-20) mm long, 2-4 mm wide; petioles 2.5-5.0 mm long, canaliform, setaceous, the rachis 1.5-4.0 mm long; stipular sheath 3-5 mm long, short bristly, 5-7 nerved, the teeth subulate, 2.5-3.5 mm long. Inflorescence spicate, 3-4 flowered; bracts 1-3 foliolate, the sheath 2.5-4.5 mm wide, bristly, 5-9 nerved, the teeth 2-3 mm long; outer bracteole 2.5-3.0 mm long, the apex ciliate; axis rudiment none; inner bracteole 1, 2.0-2.5 mm long, the apex ciliate. Flowers yellow; calyx tube 4-5 mm long, the lobes acute, ca. 1.5 mm long; standard suborbiculate, spurred within at the base, 3-4 mm long; wings 3-4 mm long, clawed and auriculate at the base; keel petals 3.0-3.5 mm long, falcate. Fruit a loment, 1.5-2.5(-4.0) mm long, 1.5-2.5 mm wide, reticulate nerved, usually puberulent, rarely pilose, only the distal articulation fertile, the beak strongly uncinate to coiled, 1.5-3.5(-5.5) mm long. Chromosomes n = 10.
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Habit
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Herbs
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Note
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Stylosanthes humilis is quite variable in size and shape of the leaflets, and in the size of the loments.
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Distribution
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ranges from central Mexico through Panama to Colombia, Venezuela, and Brazil; it also occurs in the Antilles and is adventive in Malaysia and Australia.
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Note
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In Panama, this species generally occurs at elevations below 150 m, and it is distinguished by its glabrate, apunctate leaflets and the elongate beak of the ter- minal articulation.
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Specimen
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CANAL ZONE: Cocoli Road to Contractors Hill, Dwyer 7213 (MO). La Boca, Mori & Kallunki 3687 (MO). Corozal, Standley 27403 (US). Old Las Cruces Trail between Fort Clayton and Corozal, Standley 29191 (US). Albrook Air Force Base, Tyson & Lazor 6013 (FSU, PMA). CHIRIQuI: Near David, site 64, Burt & Koster 133 (MO). Road to Divala, site 74, Burt & Koster 149 (MO). Frances Arriba School, Lewis et al. 655 (GH, K, MO, UC, US). David airport, Lewis et al. 753 (GH, MO). 5 km S of Las Lomas, McCorkle C-25 (FSU, SCZ). David, Rattray 3 (MO). COCL: Near Divisa, Burt & Koster 96 (MO). Aguadulce, Pittier 4837, 4983 (both US). COL6N: 0.7 m NE of bridge over Rio Piedras on road from Portobelo, Nee & Mori 3650 (MO). PANAMA: Between Panama and Chepo, Dodge et al. 16700 (MO). Rio Mar, Godfrey 2321 (FSU, SCZ). Las Sabanas, Heriberto 297 (US). 7 mi S of Campana, McDaniel 8339 (DUKE, FSU). Las Sabanas, Standley 25882, 25914 (both US). Near Punta Paitilla, Standley 26293 (US). Corozal Road, Standley 26794 (US). Vicinity of Juan Franco Race Track, Standley 27730 (US). Rio Tocumen, Standley 29474 (US). Las Sabanas, Standley 41178 (US). VERAGUAS: Hills W of Sond, Allen 1054 (GH, MO, US). Davisa/Santiago, 0-100 m, Burt & Rattray 75, 78, 79 (all MO). Panamerican Highway 0.5 km W of Highway 50 turnoff to Oci, 30 m, Nee 8002 (MO). 2 km NW of Atalaya, Nee 8244 (DUKE, MO, US).
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