ELATINAUE^. (WATEK-WOKT FAMILY.) 39 



» * * Perennial, with a thickened candex. 

 5. C. megarrhiza, I'arry. Hoot fusiform, very large : leaven fleshy ; 

 radical ones peiiolctl ; (.auliiie lanceolate or liuoar-laiiceolaie, sessile: raieineu 

 secuiid : flowers large, profuse, white with pinkish veins: petals ubovate, 

 suheniarginate. — Tarry in Herb. (Jray. C. airtiai, \slt. ine</arrfti2a, of Bot. 

 King's Kxp. and Fl. Colorado. High alpine, growing in crevices of the rock, 

 its large purple tap-root penetrating to a great depth. Mountains of Colonulo 

 and the Uiutas. 



5. SPRAGUEA, Torr. 



Sepals orbicular-cordate. — A glabrous biennial ; with mostly radical fleshy 

 leaves and ephemeral flowers in dense scorpioid spikes umbcHate-clustered ou 

 a scape-like ])eduncle. 



1. S. umbellata, Torr. Stems several from a thickened root, 2 to 12 

 inches high : radical leaves spatulate or oblanceolate, on thick petioles; the 

 cauline similar but smaller, freciuently scariously stipulate : an involucre of 

 scarious bracts subtending the dense capitate umbel of nearly sessile spikes : 

 flowers light rose-color: sepals very conspicuous, al)out etiualling the petals. 



— Wyoming (Pttnif), Yellowstone Park {Coulter), and westward. Usually in 

 dry rocky or sandy localities. 



6. CALYPTRIDIUM, Xutt. 



Sepals broadly ovate or orbicular. Petals .somewhat coherent at the apex. 



— Smooth prostrate diffusely branched annuals; with alternate succulent 

 leaves and small ephemeral flowers in axillary or terminal, clustered or com- 

 pound, scorpioid spikes. 



1. C. roseum, Watson. Leaves oblong-spatulate, attenuate at base; 

 radical leaves few or none : petals minute: capsule not exceeding the calyx. 



— Bot. King's Exp. 44, t. 6. W. ^Vyoming {Parry) and westward to 

 California. 



7. LEWI SI A, Pursh. 



Sepals broadly ovate, unequal, persistent. Petals large and showy. Stylo 

 parted nearly to the base. — Low acaulescent fleshy perennial.-*, ccspitose, 

 with thick fusiform roots. 



1. li. rediviva, Pursh. Leaves densely clustered, Hnear-<>l)long. sub- 

 terete, smootli and glaucous : scapes but little longer, jointed at the miiidle. 

 and with .5 to 7 subulate scarious bracts verticillate at the joint: petals rt>»e- 

 colored or white. — Arizona, Utah, Wyoming, Montana (in the Hitter K(X)t 

 Mountains), and westward. The specific name refers to the f;ict that the 

 roots are wouderfullv tenacious of life. 



Order 13. ELATIlVACE.i:. (W.vtkr-wokt Family. ) 



Low annuals, with iiicmbranoiis stipnlrs botweon the opposite dotlrsa 

 leaves, regular and mostly symmetrical flowers (*2 to 5-inerous), with 



