Eriogonum multiflorum var. riograndis

(G. L. Nesom) Reveal

Harvard Pap. Bot. 9: 184. 2004.

Common names: Rio Grande wild buckwheat
Endemic
Basionym: Eriogonum riograndis G. L. Nesom Sida 20: 32, fig. 1. 2003
Treatment appears in FNA Volume 5. Mentioned on page 327.
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Leaf blades oblong to narrowly ovate, 1.5–4(–4.5) × 1–2.2(–2.5) cm, floccose to glabrate adaxially, occasionally thickened, auriculate-subclasping proximally.


Phenology: Flowering Aug–Nov.
Habitat: Sandy to gravelly flats and slopes, mixed grassland and mesquite communities, oak and conifer woodlands
Elevation: 0-300 m

Discussion

Variety riograndis is mostly infrequent and widely scattered in central southern Texas (Aransas, Brooks, Calhoun, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells, Karnes, Kenedy, Kleberg, Nueces, Refugio, San Patricio, Webb, Willacy, Wilson, and Zapata counties), becoming common only near the coast.

Variety riograndis is found just to the west and south of var. multiflorum, and a series of overlapping (and intergrading) populations occurs along their shared boundary. Plants immediately along the coast of Texas often have thickened, almost crassulate leaf blades.

Selected References

None.

Lower Taxa

None.
James L. Reveal +
(G. L. Nesom) Reveal +
Eriogonum riograndis +
Rio Grande wild buckwheat +
0-300 m +
Sandy to gravelly flats and slopes, mixed grassland and mesquite communities, oak and conifer woodlands +
Flowering Aug–Nov. +
Harvard Pap. Bot. +
Eriogonum multiflorum var. riograndis +
Eriogonum multiflorum +
variety +