Flora of the Palousc Region 127 



H. lanatutn Michx. Yen- stout: 1-2 m. tall, pubescent throughout: 

 leaves ternate or biternate; petioles much dilated; leaflets round-cordate, 

 10-25 cm - broad, irregularly lobed and dentate; rays 5-15 cm. long: fruit 

 obcordate, 8-12 mm. broad, the oil-tubes conspicuous. Abundant along 

 streams. 



208. LOMATIUM. 



Acaulescent or short caulescent dry ground perennials: roots 

 fusiform or tuberous: leaves ternate to dissected (sometimes pin- 

 nate): involucre none; involucels mostly present: flowers yellow, 

 white or purple: calyx-teeth obsolete, very rarely evident: stylo- 

 podium wanting: fruit strongly flattened dorsally, oblong to or- 

 bicular: carpel with filiform and approximate dorsal and inter- 

 mediate ribs and winged laterals coherent till maturity with those 

 of the other carpel: pericarp thin: oil-tubes 1 several in the inter- 

 vals (rarely obsolete), 2-10 on the commissural side: seed dorsally 

 flattened, with plane face (rarely slightly concave). 



Flowers white. 



Tubers globose: fruit puberulent. 



Tubers globose: fruit glabrous. 



Tubers fusiform: fruit glabrous. 

 Flowers yellow. 



Tubers globose: fruit oblong, puberulent. 



Tubers fusiform: fruit linear, glabrous. 



Roots not tuberous, elongate. 



Leaves much dissected: ill-scented. 

 Leaves 2-3-ternate. 



L. gormanni C. & R. Glabrous, or nearly so, the proper stems short or 

 none: peduncles 5-7 cm. tall, ascending or spreading: tubers globose, about 

 2 cm. in diameter, bearing numerous roots on the under side: leaves bipin- 

 nate, the ultimate segments oblong or linear: umbel unecmally 1-10-rayed: 

 flowers white: anthers purple: fruit ovate, sessile, puberulent, 6 mm. lcng, 

 Abundant in rocky places. 



L. farinosum C. & R. Proper stems usually short: peduncles 10-30 cm. 

 high: tubers globose, rarely 2 to 3 in a row: leaves once or twice palmate; 

 leaflets linear, 1-8 cm, long, 3-5 together: umbel unequally 5-1 5-rayed, the 

 rays 2-5 cm. long: flowers white: fruit pedicelled, linear-oblong, glabrous, 

 6-8 mm. long. Rock ledges on the bluffs of Snake River. 



L. macrocarpum C. & R. Proper stems short, the peduncles 10-40 cm. 

 high, white-pubescent throughout: tubers elongate, fusiform: leaves decom- 

 pound, the ultimate segments ovate or linear, short: umbels 3-20-raved, the 

 involucels conspicuous, lanceolate: flowers white: fruit oblong, glabrous. 

 6-20 mm. long. On basalt outcroppings, common. 



L. COUS C. & R. Proper stem none: peduncles S-i 2 cm. tall: tuber sub- 

 globose or elongate: leaves glabrous, bipinnately-compound, the ultimate 

 segments oblong, acute, mostly entire: umbel 3-12-rayed, the rays unequal, 

 1-4 cm. long: flowers yellow: fruit oblong, sparsely puberulent, short-ped- 



