568 POLYGONACE.E eriogonum 



6 Rumex Sepals 6, the outer spreading, the inner enlarged and appress- 



ed to the triangular achene: stigmas 3, tufted. 



7 Oxyria Sepals 4, the'outer smaller and spreading : stigmas 2, tufted : 



achenes orbicular, winged. 



Tribe 1 Eriogoneas Meisner PL Vas. Gen. 229, as Order. Herbs 

 or shrubby plants with alternate or verticillate leaves without stipules. 

 Flowers involucrate, S-6-parted or 3-6-lobed. Stamens 9. Styles 

 3, with capitate stigmas. Juice nea rly tasteless. 



1 ERIOGONUM Michx. Fl. 1246. (1803.) 



Annual or perennial acaulescent or leafy- stemmed herbs or shrubs 

 with entire alternate opposite or whorled leaves and small, perfect 

 flowers on jointed pedicels subtended by an involucre in panicles 

 racemes heads or umbels. Involucre campanulate top-shaped or 

 almost cylindrical, 5-8- toothed or 5-8 cleft, the teeth pointless. 

 Calyx'5-cleft or 5-parted, usually colored, the segments equal or 

 the outer ones larger. Stamens 9, with filiform filaments and 

 oblong anther. Style 3-parted, stigmas capitate. Fruita3-angled 

 pyramidal^achene invested by the calyx-segments, or winged. 



§ 1 Involucre not nerved or angled, 4-8-toothed or lobed, more 

 or less broadly turbinate: bracts foliaceous, indefinite in number. 



* Perennials, more or less tomentose or rarely glabrous, with pedun- 

 cles naked and scape-like, or verticillate-bracteate in the middle: bracts 

 mostly conspicuous: involucres 5-8-toothed or 5-8- cleft, in a simple or 

 compound umbel or solitary: flowers mostly attenuate to a stipe-like 

 base: achenes glabrous or nearly so. 



E. flavum Nutt. Fras. Cat. (1813.) White-tomentose throughout: stems 

 very short and thick, simplejand solitary to tufted and creeping, woody: 

 scapes 2-12 inches high: leaves ^crowded on the short stems, linear-oblong 

 to lanceolate^l-3 inches long'narrowed into petioles with dilated and imbr- 

 icated base inflorescence regularly umbellate: involucre top-shaped, 2-2>£ 

 lines long: bracts spatulate, foliaceous: calyx yellow 3 lines high, top-shaped, 

 very villous, the segments obovate: stamens and style-branches exserted 

 achenes constricted'at the middle, 2 lines long, villous at the summit the 

 angles undulate, the faces swollen, Dry plains eastern Washington to 

 Arizona and Nebraska. 



E. Piperi Greene. " Densely tufted on a stout woody caudex: stems 

 erect, leafless tomentose, 5-10 inches tall: leaves all basal, lanceolate or 

 oblanceolate, acute or obtuse, densely hairy beneath, green and less hairy 

 above, 1-2 inches long, attenuate into a usually shorter petiole : umbels 

 9everal-rayed, simple, or contracted into a dense cluster: bracts 3-8, oblan- 

 ceolate, 1-13^ inches long: involucre short-toothed, villous: flowers yellow , 

 2-3 lines long. Summit of Cedar Mountain, Washington. Hardly distinct 

 from^E.iflavumfcNutt.^" Piper & Kent in Palouse Flora, 50. 



E.? r androsaceuiir Benth. Dwarf ^perennial: tomentose throughout or 

 smoother above: caudex branching: leaves oblanceolate or spatulate, white- 

 woolly beneath, glabrate above: scapes^2-3 inches high, simple: umbel simple 

 or subcapitate, 4-7- rayed: rays 'shorthand slender: teeth of the involucre 

 short, erect or nearly so:flo\vers sparingly villous, yellow, 2-3 lines long, short 

 attenuate. On the high mountains of eastern Washington to Brit. Columbia . 



