MONOECIA. TETRANDTllA. 207 



TSS, PACHYSANDRA. Michaux. 



Calix about 4-Ieaved. Corolla none. FUa- 

 ments subchivate. Styles 3. Capsules 3-horned, 

 3-celled; cells 2-seecled. 



Root creeping; stem very low and simple; leaves alter- 

 nate, pubescent, without stipules; spikes nearly radical, 

 the lower part feminine; fxowers bracteate. 



Species. V . procumbent. The only species of the ge- 

 nus indigenous to the Alleghany mountains. Scarcely dis- 

 tinct from Tricera. 



739. DIOTIS. Schreber, 



Masc. Calix 4-leavcd, Corolla none. Fem. 

 calix 1 -leaved, 2 horned. Style biparted. Seed 

 1, villous, covered by the 2-borned calix. 



SufFruticose, leaves alternate, entire; flowers axillary. 



Species. 1. D. lanaia. Va. Obs. Stem suffruticose, 

 12 to 18 inches high, partly erect and lanuginous; leaves 

 crowded, linear-sublanceolate, at first revolute on tlie 

 margin, canescovly ianaginous; flowers conglomerated, 

 glomeruli axillary, masculine flowers superior. II ab. On 

 tlie banks of tlie Missouri, in arid situations near the 

 " Grand Detour." Flowering in June. 



Of tills genus there is a second species indigenous to 

 I'artary and Arabia. 



740. BCEUMERIA. WiUd. 



Mas. Caiia:4-parted. Corolla none. J^ectarij 

 noiae. Fem. Calix and corolla none. Seed 1, 

 compressed. 



. Shrubby of herbaceous; leaves opposite or alternatCj 

 often oblique; flowers capitate. Nearly allied to Urtica^ 



Species. 1. B. cyUncbncn.. 2. Jaterifiora. 



A genus of 21 species, principally indigenous to tropi- 

 cal America and India. 



741. URTICA. L. (Nettle.) 



Masc. Calix 4-leaved. Corolla none. JVec- 

 tary central, mostly cyathiform. Fem. Calix 

 2-valved. Corolla none. Seed 1, shining. 



