BUCKWHEAT FAMILY 231 



anth. SHEEP SORREL. Waste places, old fields, etc.: Lab. Fla. Calif. 

 Alaska.; nat. from Eu. Plain Submont. Ap-Au. 



2. R. Acetosa L. Perennial, with a short rootstock; stem erect, 3-10 dm. 

 high; leaf-blades oblong-hastate or ovate-sagittate, 3-12 cm. long, acute at the 

 apex, with acute auricles, the basal ones petioled, the upper cauline ones sessile; 

 perianth green, 2 mm. long, in fruit winged, broadly ovate or orbicular, cordate, 

 5 mm. long, with delicate callosities at the base. SOUR DOCK. Waste places: 

 Lab. N.Y. Mont. 'Alaska; adv. from Eu. Plain Submont. Je-Au. 



3. R. paucifolius Nutt. Perennial, with a taproot and short rootstock, 

 somewhat tufted; stem 2-5 dm. high; leaf -blades lanceolate or oblanceolate or 

 sometimes elliptic, the lower petioled, 5-12 cm. long, the upper sessile; perianth 

 yellowish green or reddish, 1.5 mm. long; divisions winged, in fruit about 4 mm. 

 in diameter, rounded, sometimes with a small basal callosity. R. Geyeri (Meisn.) 

 Trelease. Meadows: Alta. -Colo. Calif. -B.C. Submont. Mont. My-Au. 



4. R. venosus Pursh. Stem stout, erect or decumbent at the base, 1.5-4 

 dm. high, somewhat fleshy; leaf-blades ovate, ovate-lanceolate, or oblong, 3-12 

 cm. long, fleshy, somewhat glaucous; panicle rather dense, conic; perianth red, 

 pedicelled, about 5 mm. long; inner lobes in fruit much enlarged, orbicular, 2-5 

 cm. broad, venose, cordate at the base; achene 7 mm. long. WILD BEGONIA, 

 SOUR GREENS, WILD HYDRANGEA. Sandy soil: Sask. Mo. Nev. Wash. 

 Alta. Plain -Submont. Ap-Je. 



5. R. salinus A. Nels. Stem stout, 2-4 dm. high, glabrous; leaf-blades 

 moderately thick, somewhat crisp, the lower oblanceolate-oblong, 10-15 cm. 

 long, the upper lanceolate; perianth red, about 3 mm. long; inner lobes in fruit 

 enlarged, reniform-cordate. R. tuberosus A. Nels. Alkaline soil: w Wyo. 

 Colo. Submont. Je. 



6. R. hymenosepalus Torr. Stem 3-10 dm. high, glabrous; leaf-blades 

 somewhat fleshy, somewhat crisp, 5-20 cm. long, elliptic or oblanceolate; perianth 

 yellowish green, 3-4 mm. long; inner lobes in fruit much enlarged, cordate, 

 longer than broad, with an open sinus. Dry or sandy soil: Tex. Okla. Utah 

 -Calif.; n Mex. Son. -Mont. Mr-My. 



7. R. praecox Rydb. Stem 2-3 dm. high, striate; basal leaves petioled, 

 rather thick, oval or elliptic, 4-10 cm. long, rounded at both ends; perianth-lobes 

 oval, rounded at the apex, the inner 3-5 mm. long, without tubercles. Along 

 streams, in the mountains: Colo. Wyo. Mont. Je. 



8. R. hesperius Greene. Stem 3-6 dm. high; leaf-blades lanceolate or 

 linear-lanceolate, slightly wart} ; panicle small; perianth purplish or greenish, 3 

 mm. long; inner lobes in fruit 4-5 mm. long, deltoid or reniform-deltoid, more 

 or less reticulate, denticulate on the margins. Bottom lands: Alta. Wyo. 

 Wash. Submont. My-Jl. 



9. R. conflnis Greene. Stem stout, 4-15 dm. high; blades of the basal 

 leaves 1-3 dm. long, oblong-lanceolate to oblong-ovate, cordate at the base; 

 panicle large; flowers greenish; perianth 4 mm. long; inner lobes suborbicular or 

 rounded-cordate, crenate-dentate, rather strongly reticulate. Wet places: B.C. 

 Mont. Wash. Son. Je-Jl. 



10. R. occidentalis S. Wats. Stem 5-20 dm. high; blades of the basal 

 leaves oblong-lanceolate, truncate or subcordate at the base, 1-3 dm. long; 

 panicle narrow, elongate; perianth greenish, 3-4 mm. long; inner lobes in fruit 

 broadly cordate, denticulate towards the base; achenes 3 mm. long. R. 

 polyrrhizus Greene, in part. Wet places: Lab. N.D.N.M. Calif. B.C. 

 Plain Mont. Jl-Au. 



11. R. densiflorus Osterh. Stem 5-10 dm. high, grooved; blades of the 

 basal leaves elliptic or oblong-lanceolate, cordate at the base, 1.5-3 dm. long, 

 10-15 cm. wide; flowers polygamous; perianth often red, 3 mm. long; inner 

 lobes broadly ovate-cordate, reticulate. R. Bakeri Greene. Wet ground: Colo. 

 Wyo. Ida. PlainMont. Jl-Au. 



12. R. subalpinus M. E. Jones. Stem erect, sulcate, 1-2 m. high; blades 

 of basal leaves 2-4 dm. long, 5-20 cm. wide, oblong-lanceolate to elliptic, entire, 



