216 POLYGON ACE AE 



Scape strongly inflated under the first node. 115. E. fusiforme. 

 Accessory branches of the lowest node of the inflorescence few and small 

 or none; branches ascending; scape usually inflated. 



116. E. inflatum. 



XVIII. DiVARICATA. 



Leaves green, puberulent; involucres 5-cleft. usually sessile. 117. E. divaricatum. 

 Leaves floccose beneath; involucres 5-toothed, peduncled. 118. E. angulosum. 



XIX. PUBERUL.A.. 



One species. 119. E. puberulum. 



XX. Spergulina. 



Leaves green, merely pilose; scape glandiflar. 120. E. spergulinum. 



Leaves tomentose beneath; scape finely pubescent. 121. E. pharnaceoides. 



XXI. SALSUGINOS.i. 



One species. 122. E. salsuginosum. 



1. E. alatum Torr. Stems erect, 3-10 dm. high; leaves mostly basal, 

 tufted, spatulate or oblanceolate, 3-10 cm. long, hirsute above, glabrous beneath, 

 except the strong midrib; panicle open; involucres in small cymes; perianth cam- 

 panulate, greenish yellow, 2 mm. high, glabrous; achenes 5-7 mm. long, glab- 

 rous. Plains and table-lands: Neb. — Tex. — Ariz. — Wyo. Son. — Plain — Mont. 

 Je-Au. 



2. E. triste S. Wats. Stems 3-5 dm. high, sparingly hirsute or glabrate; 

 leaves mostly basal, oblanceolate, 8-10 cm. long, ciliate on the margins, otherwise 

 glabrous; inflorescence paniculate; involucres in cymes; perianth glabrous, cam- 

 panulate, 2 mm. long, brownish red; achenes 5-6 mm. long. E. alatum glabrius- 

 culum Torr. Sandy soil: Tex. — s Colo. — s Utah — Ariz. Son. — Mont. 



3. E. Jamesii Benth. Stems decumbent at the base, 1-3 dm. high, tomen- 

 tose; leaves mostly basal, petioled, 3-8 cm. long; blades elliptic-spatulate, thick, 

 green, densely white-tomentose beneath; involucres deeply campanulate, 5 mm. 

 high, tomentose; perianth 4-5 mm., becoming 7-8 mm. long; inner lobes slightly 

 longer than the outer; achenes 4 mm. long, pubescent at the base. Plains and 

 hills: Tex. — Kans. — Colo. — Ariz. Plain — Mont. Jl-S. 



4. E. Bakeri Greene. Stems scapiform, 1-3 dm. high; leaves basal, petioled, 

 2-5 cm. long, somewhat tomentose above, but in age more glabrate and greenish, 

 densely white-tomentose beneaith; involucres campanulate, tomentose; perianth 

 silky-villous. E. Jamesii flavescens S. Wats. E. vcgetius (T. & G.) A. Nels. 

 Hills: Wyo. — -N.M.— Ariz. — Utah. Submont. — Mont. 



5. E. arcuatum Greene. Stems scapiform, about 1 dm. high, tomentose; 

 leaves basal, petioled, 2-5 cm. long, tomentulose but greenish above, white- 

 tomentose beneath; involucres tomentose; perianth 6-7 mm. long, silky below. 

 Mountains: Colo. — -Utah. Submont. — Subalp. Jl. 



6. E. Piperi Greene. Stems scapiform, 1-3 dm. high, villous; leaves basal, 

 petioled, 3-10 cm. long; blades thin, oblanceolate or elliptic-oblanceolate, green 

 and villous above, white-tomentose beneath; perianth yellow, 5-6 mm. long, 

 turbinate; filaments hairy below; achenes villous at the apex. Open valleys: 

 Wash. — Wyo. — ^Mont. Submont. — Mont. 



7. E. flavum Nutt. Stems 1-2 dm. high, scapiform, white-tomentose; 

 leaves thick, petioled, 3-5 cm. long; blades oblanceolate, densely tomentose on 

 both sides, greenish in age above, snowy-white beneath; perianth yellow; fila- 

 ments villous at the base; achenes 4 mm. long, villous. E. sericeus Pursh. E. 

 crassifolius Benth. Dry hills, mountains and canons: Man. — Neb. — Colo. — 

 Alta. Plain — Subalp. 



8. E. chloranthum Greene. Stems scapiform, 1-2 dm. high, tomentose; 

 leaves bfisal, not ver\' tliick, petioled, 3-5 cm. long; blades oblanceolate, some- 

 what tomentose, but green above, white-tomentose beneath; perianth orange or 

 greenish orange. E. aureum Nutt., not M. p]. Jones. E. flavum A. Nels., in 

 part. Mountains: Colo. — Wyo. Subalp. Jl-Au. 



9. E. polyphyllum Small. Stems scapiform, 1-1.5 dm. high; leaves basal, 

 numerous, 1-3 cm. long; blades villous but green and glabrate above, densely 



