Flora of the Palouse Region 125 



G. parviflora Dougl. Annual, erect, 1-2 in. high, whitish-pubescent 

 throughout, the stems villous: leaves numerous, ovate or lanceolate, acute, 

 entire or denticulate, rounded at base, nearly sessile, silky-pubescent, some- 

 what villous-ciliate, 6-10 cm. long: flowers small, pink, 3-4 mm. broad, in 

 erect spikes, 8-30 cm. long: bracts lanceolate, quickly deciduous: fruit sessile, 

 fusiform, glabrous, 6-8 mm. long. Sandy banks of Snake River. 



Family 55. UMBELLIFERAE. 



Herbs: stems usually hollow: leaves compound or simple; 

 petioles often dilated at the base: flowers small, in umbels or 

 rarely in heads, the umbels often subtended by primary bracts 

 (the involucre); in compound umbels, the secondary rays often 

 subtended by secondary bracts (the involucels): calyx entirely 

 adherent to the ovary: petals and stamens on the calyx-tube: base 

 of the style (stylopodium) often expanded: ovary 2-celled, 2-ovuled: 

 fruit of 2 seed-like dry carpels with contiguous inner surfaces (the 

 commissure), each carpel marked lengthwise with 5 primary ribs 

 and often with 4 intermediate secondary ones, in the intervals be- 

 tween which oil-tubes are commonly found: carpels often separat- 

 ing from each other, supported on the summit of a slender axis 

 (the carpophore). Mature fruits are absolutely necessary for 

 accurate determinations in this family. 



Flowers in dense heads. 21 r. krvxch'm. 



Flowers not in heads, evidently umbellate. 

 Fruit bristly. 



Fruit narrow, elongated: bristles appressed. 212. osmorrhiza. 



Fruit short, ovate: bristles spreading. 205. caucaus. 



Fruit not bristly. 



Oil-tubes obsolete or obscure. 212. osmorrhiza. 



Oil-tubes distinct. 



Fruit strongly flattened dorsally, with lateral ribs more or less 

 prominently winged. 

 Oil-tubes solitary in the intervals. 



Stylopodium thick, conical: plants large. 



207. HERACLKTM. 



Stylopodium none: plants small or medium sized. 



208. LOMATIUM. 

 Oil-tubes more than one in the intervals. 



Caulescent and branching. 206. ANGELICA. 



Acaulescent or nearly so. 210. leptotaexia. 



Fruit not strongly flattened dorsally, usually more or less lat- 

 erally flattened. 

 Oil-tubes solitary in the intervals. 

 Stylopodium conical. 



Leaflets (at least the upper) linear to filiform. 



215. CARTJM. 

 Leaflets broader. 216. CICTJTA. 



Stylopodium flat or wanting. 214. zizia. 



Oil-tubes more than one in the intervals. 



Ribs conspicuously winged. 209. ptekvxia. 



Ribs not winged. 213. sum. 



