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1. Shinnersia rivularis (A. Gray) R. M. King & H. Robinson, Phytologia. 19: 297. 1970.
Rio Grande bugheal
Trichocoronis rivularis A. Gray, Mem. Amer. Acad. Arts, n. s. 4: 66. 1849
Plants rooted in muck; rhizomes relatively long. Stems commonly submerged except for terminal 10 cm or less. Leaves mostly 2–4 cm. Heads borne out of water. Corollas ca. 2 mm. Cypselae ca. 2 mm. 2n = 60.
Flowering (Dec–)Mar–May(–Aug). Water along streams, in slow-moving water (to 1 m deep) arising from calcareous outcrops; 50–3000 m; Tex.; Mexico (Coahuila, Nuevo León).
Shinnersia rivularis has been treated within Trichocoronis. The genera differ in features noted in the couplet below. Sclerolepis, of the southeastern United States, apparently also is closely related, and its recognition as separate reinforces recognition of Shinnersia.
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Heads borne singly, from axils of primary leaves; involucres 5–6 mm; corollas infundibular, tubes relatively long; cypselae sparsely gland-dotted and with forked hairs; carpopodia oblique; pappi 0. |
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400 Shinnersia |
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Heads usually in loose or open, corymbiform, bracteate arrays; involucres 2–3 mm; corollas tubular-funnelform, tubes relatively short; cypselae eglandular, scabrellous on angles, without forked hairs; carpopodia at right angles; pappi persistent, of 2–6 setiform scales. |
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399 Trichocoronis |
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