BUCKWHEAT FAMILY 21 



Leaves densely villous on both sides. 85, E. bicolnr. 



Peduncles clavate-thickened upwards. 86, E. clavcUatum 



he inflorescence strongly angled and deeply grooved. 



87. E. sulcatum. 



88. E, annuutiu 



XIV. A,\-.\UA. 

 One species. 



XV. Racemosa, 



Leaves crowded on the short branches of the caudex; blades abruptly narrowed at the 

 base or subc^rdate. 89. E. racemosum, 



Liea ves scattered on the fruticose branches ; blades tapering at the base 



Leaf-blades elliptic or oblanceolate. 90 E Wrightii 



Leaf-blades linear. 91. E. leptocladon. 



XVI. ViRGATA. 



Stem neither divaricately branched, nor densely flocc^se. 



Involucres cylindric; perianth-segments oblong or oval; plant with few branches 

 Involucres about 3 mm. long. 92. E. vimineum. 



Involucres about 2 mm. long. 93. E. Bailcyi. 



involucres campaniUate, 1-1.5 mm. long; perianth-segments cxmeate, flabellate. or 



nddle-shaped ; plants with numerous branches. 

 Branches not incurved in age; leaf-blades ovate or oblong. 



T» , . , . . 94. E, densum, 



Branches mcurved m age; leaf-blades orbicular or subrenifomi. 



o. ,. . . , , , , , ^^- E- nidularium. 



btem divaricately branched, densely floccose. 96. E, PlumatcUa, 



XVII. PEDtTVCULATA, 



Perennials with a woody caudex. 97. E, tenellum. 



Annuals. 



Perianth glabrous or in E. Thomasii B.nd E. nutans somewhat pubescent; segments 



mostly obtuse or rounded at the apex. 

 Peduncles not glandular. 



Scape and its branches glabrous. 



Peduncled reflexed or at least divaricate; leaves tomentose on both sides, 



less so above. 



Involucres 1.5-2 mm. long; perianth 1.5-2 mm. long. 



Peduncles shorter than the involucres; outer perianth-lobes ovate or 



subreniform. 



Perianth pale yellow; outer segments subreniform. 



98. E. Hookeri, 

 Perianth white; outer segments ovate. 99. E. deflexum. 

 Peduncles longer than the involucres; outer perianth-segments 

 obovate or panduriform; perianth white or pinkish. 



100. E. cernuum. 

 Involucres 0.5 mm. long; perianth 1-1.5 mm. long, vellowish with red- 

 dish veins. 101. £. Wetherillii. 



Peduncles erect or ascending. 



Leaves more or less tomentose beneath. 

 Involucres 1.5-2 mm. long. 



Perianth yellow; segments similar, 102. E. pusillum. 



Perianth white or rose-colored; segments unlike. 



Involucres campanulat«; outer perianth-segments flabellate. 



103. E. rotundifolium. 

 Involucres turbinate: outer perianth-segments not flabellate. 

 Outer perianth-segments oblong-ovate, the inner ones 



entire. 104. E. insigne. 



Outer perianth-segments subreniform. the inner ones 3- 

 toothed, much smaller. 105. E. turbinatum. 



Involucres scarcely 1 mm. long; perianth yellowish or white, usually 

 somewhat hispidulous at the base. 106. E. Thomasii, 



'Leaves green, glabrate or sparingly pilose. 107. E. Gordonii. 

 Scape more or less pubescent, at least at the nodes. 



Leaves white-lanate beneath. 108. E. subreniforme. 



Leaves green on both sides, sparingly pUose. 109. E. trinervatum. 



Peduncles glandular; leaves tomentose. 



Outer perianth-segments oval, emarginate or retuse, the inner ones oblong. 



110. E. nutans. 

 Outer perianth-segments ovate-cordate, the inner ones oblong-ovate, acute. 



T, . , ^ 111. £. Parryi, 



i^erianth pubescent; segments ovate or lanceolate, acute. 



Peduncles and usually also the scape glandular; leaves green, merely hirsute be- 



neath. 112. E. glandulosum. 



Peduncles and scape not glandular. 



Leaves floccose or tomentose beneath. 113. E. Ordii. 



Leaves green, merely pilose or hirsute. 



Accessory branches at the lower forks of the inflorescence many and nearly 



as strong as the primary ones; all divaricate. 

 Scape slightly if at all inflated. 114. E. trichopodum. 



