310 



NORTH AMERICAN FLORA 



[Volume 25 



Sepals sparsely glandular-ciliate; wings glabrous. 84. P. lonsa. 



Flowers small or medium, the wings 2-5.3 (rarely 8) mm. wide; herbs, 

 with small mostly linear or oblong leaves. 

 Plants perennial; wings usually surpassing the capsule. 



Wings quadrate-suborbicular, the lamina wider than long, 



strongly prominulous-reticulate. 85. P. grandiflora. 



Wings euneate-obovate or broadly obovate, the lamina not as 

 wide as long, less reticulate. 

 Stem densely pubescent. 



Leaves elliptic, 5-11 mm. wide. 



Hairs of stem all incurved or incurved-spreading. 86. P. Planellasi. 



Hairs of stem partly long, straight, and wide- 

 spreading, partly short and incurved. 87. P. mollis. 

 Leaves linear, 1.5-2 mm. wide. 88. P. Wrightii. 

 Stem finely incurved-puberulous or glabrous. 



Stem glabrous. 89. P. ambigens. 



Stem finely incurved-puberulous. 90. P. miamiensis. 



Plants annual; wings usually shorter than the capsule. 



Plant pubescent or strongly puberulous. 91. P. bryzoides. 



Plant glabrous or very sparsely incurved-puberulous. 



Wings obovate, narrower than long, not reticulate; leaves 



linear or linear-lanceolate. 92. P. cubensis. 



Wings quadrate-suborbicular. as broad as or broader than 



long, reticulate; leaves elliptic to linear-elliptic. 93. P. Krugii. 



IX. Eurhinotropis 

 Flowers 8-12 mm. long. 



Plant glabrous or sparsely and minutely strigillose; branches not 

 spinescent. 

 Aril with conspicuous conifc or cylindric umbo; capsule firm- 

 walled, scarcely reticulate; no basal racemes of cleistog- 

 amous flowers. 

 Flowers purplish and yellowish; wings merely ciliate. 

 Flowers yellowish or greenish-white; wings densely puber- 

 ulous. 

 Aril with short and rounded umbo, concealed by the scarious 

 lobes; capsule thin-walled, reticulate; basal racemes of 

 cleistogamous flowers present. 

 Plant densely spreading-puberulous, at least on the younger parts; 

 branches spinescent. 

 Flowers 4-5.5 mm. long. 



Branches spinescent ; flowers scattered or few, not forming genicu- 

 late racemes; keel scarcely beaked. 

 Branches not spinescent; flowers in usually geniculate racemes; 

 keel distinctly beaked. 

 Leaves oval, glabrous or sparsely incurved-puberulous. 

 Leaves 1-2 cm. long, 4-12.5 mm. wide. 

 Leaves 4—9 mm. long, 2-6.5 mm. wide. 

 Leaves squamiform to lanceolate, or when broader densely 

 pubescent. 

 Leaves not squamiform. 



Leaves, or at least the lower ones, oval to suborbicular, 

 like the stem densely spreading- or incurved-spreading- 

 pubescent. 

 Leaves mostly linear to lanceolate, merely incurved- 

 puberulous like the stem. 

 Leaves squamiform, 1-4.5 mm. long. 



94. P. Fishiae. 



95. P. cornuta. 



96. P. californica. 



97. P. subspinosa. 



98. P. acanthoclada. 



99. P. nitida. 

 100. P. eucosma. 



101. P. Lindbeimeri. 



102. P. Tweedvi. 



103. P. minulifolia. 



X. PantomonE 



Stem densely canescent-pilosulous; leaves obovate or oblanceolate. 104. P. Rusbyi. 



Stem sparseiy strigillose; leaves linear to linear-lanceolate. 105. P. deserlorum. 



A single species. 



XI. Tricmsperma 



XII. TlMUTUA 



106. P. paucifolia. 



Sepals not decurrent on the pedicels; pedicels not winged; flowers never truly yellow, the racemes 

 never compounded into a cymose panicle. 

 Seeds not obconic or silky-comose. 

 Hairs of seed not glochidiate. 



Cleistogamous flowers absent; flowers white to purple. 

 Leaves never ovate, rarely more than 4 mm. wide. 



Wings equaling or exceeding keel, rarely slightly 

 shorter; stem not glaucous; aril 2-lobed, 

 rarely obsolete. 

 Leaves linear to obovate, if rarely scale-like, then 

 the lower whorled. 



