All Floras      Advanced Search
FNA Vol. 5 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 5 | Polygonaceae | Eriogonum

116. Eriogonum prattenianum Durand, J. Acad. Nat. Sci. Philadelphia. n. s. 3: 100. 1855.

Herbs or subshrubs, spreading and matted or rounded to erect, 1-5 × 3-5 dm, glabrous. Stems: caudex spreading to erect; aerial flowering stems erect, slender, solid, not fistulose, arising at nodes of caudex branches and at distal nodes of short, non-flowering aerial branches, (0.5-)1-3 dm, glabrous, with a whorl of 3-6, leaflike bracts ca. midlength, similar to leaf blades, 0.7-1 × 0.2-0.4 cm. Leaves in compact basal rosettes; petiole 0.1-0.5 cm, tomentose; blade elliptic to ovate, 0.5-1.5(-2) × 0.2-0.7 cm, densely white-tomentose on both surfaces or sometimes subglabrous and pale green adaxially, margins entire, plane. Inflorescences capitate, 0.8-2 cm wide; branches absent; bracts absent immediately below involucre. Involucres 1 per node, campanulate, 3-4 × 3-8 mm, tomentose; teeth 8-10, occasionally lobelike, erect to reflexed, 1-3 mm. Flowers 3-8 mm, including 1-1.5 mm stipelike base; perianth yellow, glabrous; tepals monomorphic, spatulate to obovate; stamens exserted, 3-4 mm; filaments pilose proximally. Achenes light to rusty brown, 4-5 mm, glabrous.

Varieties 2 (2 in the flora): California.

1 Leaf blades tomentose on both surfaces; n and c Sierra Nevada, Nevada County to Mariposa County   116a var. prattenianum
+ Leaf blades tomentose abaxially, subglabrous adaxially; s Sierra Nevada, Madera and Fresnocounties   116b var. avium


Related Objects  
  • Distribution Map
  • Map

     |  eFlora Home |  People Search  |  Help  |  ActKey  |  Hu Cards  |  Glossary  |