GEKANIACE^. (GERANIUM FAMILY.) 43 



forming an extrrior rup-slaiiHil calyiuJns: petals sulphur-yellow: ityJet united 

 almost to the top: capsule shorter than the s^/mls. — Kruiu S. Colorado to the 

 Missouri Kiver. 



3. L. Kingii, Watson. Stems jjanicled above, shruhhy at base: leavca 

 linear or narrowly ol)l()iig, ohtnsc : styles distinct: capstde soiueuitai txceeding 

 the sepals. — Bot. King's Exp. 4'J. Mountains of Utah. 



Order 17. «\GOriIVLL4C E.i:. 



Distinguished from allied orders by the opposite compound leaven, 

 with interposed stipules and entire dotless leaflets. — Sepals 5, distinct. 

 Petals hypogyuous, imhricated in the bud. Stamens (in ours) twice as 

 many as the petals and inserted with them. Ovary 5 to J2-c«'llcd, with 

 a single terminal style. Fruit dry. — Ours are herbs or shrubs, with 

 solitary flowers on lateral or terminal naked peduncles, and ovary sur- 

 rounded at the base by a disk. 



1. Tribulus. Leaves abruptly pinnate, 6 to lO-foliolate. Fruit tnberculate. Ilerbs. 



2. L,ari-ea. Leaves 2-folioLite. Fruit deiisely hairy. Ileavy-sceuted shrubs. 



1. TRIBULUS, L. 



Sepals mostly persistent. Petals fugacious. Disk annular, 10-lobed. 

 Stamens 10, the alternate filaments a little shorter and with a gland at base 

 on the outer side. Ovary 5 to 12-celled. Fruit lobed, separating into roughly 

 tuberculate carpels. — Loosely branched and hairy prostrate herbs, with ap- 

 parently axillary vvhite or yellow flmvers. 



1. T. maximus, L. Leaflets ovate-oblong, more or less obli(|ue ; sepals 

 very hairy, linear, acuminate : fruit beaked by a stout style. — Kallstramia 

 maxima, Torr. & Gray. Fremont County, Colorado {Brnndeyee), to S. Cali- 

 fornia and Texas. 



2. LARREA, Cav. Creosote-bush. 



Sepals deciduous. Petals unguiculate. Disk 10-lobed. Filaments winged 

 below with a bifid scale on the inner side. Ovary 5-ceIled. Fruit globose, 

 shortly stipitate, separating into 5 hairy one-seeiled carpels. — Kvergreen 

 heavy-scented shrubs, with nodose branches, and yellow flowers. 



1. L. Mexicana, Moric. Diffusely l)ranched. 4 to 10 feet high, densely 

 leafy, of a yellowish hue: leaves nearly .^sessile; the thick rosiMons leafleta 

 inequilateral, with a broad attachment to the rachis : sepals silky : scalc.<» 

 a little shorter than the filament, somewhat lacerate : fruit beaked hy a 

 slender style. — S. Colorado to California and Texas. 



Order 18. OEKAMIACE.T:. (Of.ranum Family.) 



Leaves generally with stipules, either l.»bed or compound. Flowers 

 on axillary peduncles, regular (in oui-s) and tho parts in fives. Stamens 

 mostly 10, often somewhat monadelphous. Ovary 5-celled, with a cen- 

 tral axis. 



