450 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Branches conspicuously glandulur-tuberculate. Spikes single. 

 Stems and leaves glabrous. Spikes beadlike. 



Spikes long-pedunculate; bracts much shorter than the 



calyx. Leaflets 2 to 3 mm. long 93. P. hemsleyana. 



Spikes short-pedunculate; bracts equaling the calyx. 

 Bracts broadly obovate : leaflets 3 to 5 mm. long. 



94. P. trochilina. 

 Bracts lanceolate; leaflets 1 to 2 mm. long. 



95. P. minutifolia. 

 Stems and leaves more or less pubescent. 

 Calyx merely puberulent, brown; leaflets 11 to 21, 2 to 3 



mm. long. Spikes oblong 96. P. naviculifolia. 



Calyx canescent ; leaflets 3 to 7, if more numerous more 

 than 3 mm. long. 

 Spikes elongate and lax in fruit. Bracts soon deciduous. 



Leaves long-sericeous on both sides 97. P. argryrea. 



Leaves short-pubescent on the upper surface. 



Calyx villous-canescent. the lobes equaling the tube. 

 Bracts ovate-acuminate, longer than the buds. 



98. P. seemanni. 

 Calyx silky-canescent with appressed hairs, the 

 lobes shorter than the tube. 

 Bracts ovate or ovate-lanceolate, shorter than 



the buds 99. P. tuberculata. 



Bracts lance-subulate, longer than the buds. 



100. P. canescens. 

 Spikes dense and short, even in fruit. 

 Spikes (without the corollas) more than 1 cm. thick» 

 acute at first; corolla more than 1 cm. long; 

 leaflets 7 to 31. 



Leaflets 7 to 13, sericeous 97. P. argyrea. 



Leaflets 13 to 31, short-pubescent with spreading^ 



hairs 101. P. conzattii. 



Spikes 7 to 8 mm. thick, obtuse; corolla less than 

 1 cm. long ; leaflets 5 to 9. 

 Leaves glabrous above, minutely puberulent be- 

 neath 102. P. tuberculina. 



leaves canescent on both sides. 



Spikes oblong. 2 to 3 cm. long, distinctly peduncu- 

 late 103. P. fulvosericea. 



Spikes globose or short-oblong, 1 to 1.5 cm. long, 

 subsessile or very short-pedunculate. 

 Pubescence appressed ; leaflets 3 to 8 umi. long. 



104. P. dorycnoides. 

 Pubescence spi-eading ; leaflets less than 3 mm. 



long. 

 Leaves greenish, minutely canescent ; calyx 

 silky-villous with brown hairs. 



105. P. polycephala- 

 Leaves and calyx villous-canescent with long- 

 whitish hairs 106. P. decora. 



1. Parosela filiciformis (Kobins. H. Greenm.) Rose, Contr. U. S. Nat. Herb. 8: 

 303. 1005. 

 DaUd flliriforiiiin Kobins. & Oreenm. Proc. Amer. Acad. 29: 382. 1894. 



