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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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Trifolium dubium Sibth.
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PlaceOfPublication
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Fl. Oxon. 231. 1794.
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Synonym
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Trifolium filiforme var. dubium (Sibth.) Fiori & Paoletti, Flor. Ital. 4: 140. 1907.
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Description
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Annual herbs to 2 dm; stems lightly pilose. Leaves pinnately trifoliolate, the leaflets obovate lanceolate, 5-15 mm long, 3-5 mm wide, apically rounded or retuse and dentate, cuneate basally, the secondary veins prominent, diverging from the midvein at about 300; petioles usually shorter than the leaflets, pilose to glabrate; stipules usually ovate, 3-5 mm long, fused to the petiole along much of its length. Inflorescences numerous, compressed racemose, the peduncles pu- bescent, 15-20 mm long; bracts minute. Flowers subsessile, ca. 3.5 mm long; calyx narrow campanulate, 1-2 mm long, the teeth linear, the lowermost tooth the longest, about equal to the tube in length, with few hairs at the apex; corolla white, standard obovate, ca. 3 mm long, minutely serrulate toward the apex, cuneate at the base, the wing petals subcircular, ca. 3 mm long, the lower margin constricted sharply at the base, the auricle uncinate, ca. 0.7 mm long, the claw ca. 1 mm long, the keel petals oblong, ca. 2.5 mm long, shorter than the wing petals; stamens diadelphous, the filaments united for 1/2 their length; ovary stip- itate for ca. 1.5 mm, oblong rotund, 1-4-ovulate, glabrous, the style slightly curved, ca. 0.5 mm long. Fruits small, somewhat compressed, usually 1-seeded.
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Habit
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herbs
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Note
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This species is native to Europe and western Asia and is naturalized in North America. Apparently common in Costa Rica, it also occurs in Panama, the West Indies and sporadically in South America.
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Common
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Little Hop Clover
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Specimen
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CHIRIQUI: Cerro Punta, entrada a finca San Roman, 1500-2300 m, Beliz 224 (MO). Bajo Grando, 1-3 km E of town of Cerro Punta, Nee 10032 (MO). Rio Chiriqui Viejo, G. White 56 (MO). Roadside woods halfway between Cerro Punta and Bambito, 5600 ft, Wilbur et al. 10900 (MO).
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Tag
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Project Name
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