56 KEY TO THE SPECIES 



2. Musineon Hookeri (T. & G-.) Nutt. (Hooker's Musineon). Resembling 

 the preceding ; stems minutely scabrous or pubescent, the rachis of the leaves 

 scarcely winged ; fruit minutely scabrous. Naked slopes and ridges. 



3, Musineon tenuifolium Nutt. (Scapose MtisiNEON). Tufted ; the numerous 

 tri-pinnatifid glabrous leaves crowded at the base ; the segments linear ; peduncles 

 slender, much surpassing the leaves ; fruit nearly glabrous. Stony slopes and 

 ridges. 



2. HARBOURIA (Harbouria) 



Root-leaves several, tufted ; stem-leaves 1-3, all ternately decompound with 

 linear segments ; peduncles long, singly or more usually 2 from the uppermost 

 leaf ; ribs of the carpels obtuse and prominent, corky-thickened. 



1. Harbouria trachypleura (Gray) C. & R. (Harbour's Parsnip). From 

 3-5 dm. high : umbels crowded, 15-25 rayed ; the rays 12-25 mm. long ; carpel 

 nearly round in cross-section, about 4 mm. long. 



3. ZIZIA 



Smooth herbs 3-7 dm. high, with ternately divided leaves Cor the basal ones 

 simple), broad-toothed leaflets, yellow flowers, and ovate to oblong smooth fruit 

 with slender ribs. 



1. Zizia cordata (L.) Koch. (Heart-leaved Meadow Parsnip). Basal leaves 

 cordate or rounder, crenately toothed, rarely lobed ; stem-leaves 3- or 5-divided, 

 with leaflets ovate to lanceolate, serrate ; fruit ovate. Open ground, wet valleys. 



4. WASHINGTONIA (Sweet Cicely) 



Glabrous or hairy herbs 3-8 dm. high, from thick aromatic roots, with ter- 

 nately compound leaves, ovate leaflets, white flowers, and linear very bristly fruit 

 with prominent tail-like prolongation at base. 



1. Wasliingtonia obtusa 0. & R. (Rocky Mountain Sweet Cicely). Slender 

 and nearly glabrous ; leaflets ovate to lanceolate, sharply toothed ; umbel with 

 widely divaricate rays ; peduncles only 2-4, longer than the obtuse, only slightly 

 pubescent or hispid fruit. Moist rich woods. 



5. PHELLOPTERUS 



Stemless or short-stemmed from thick roots with pale bipinnate leaves and 

 umbels with scarious involucres and involucels, fruit oblong to orbicular. 



1. Phellopterus montanus Nutt. (Mountain Phellopterus). Stemless 

 and nearly smooth, the flowers and fruit closely appressed to the ground among 

 the bases of the leaves ; carpels large, with 3-5 broad membranous wings. Early 

 spring, on the plains. 



6. LOMATIUM 



Short-stemmed or stemless ; leaves ternate or pinnate ; fruit much flattened 

 dorsally ; only the lateral ribs winged. 



1. Hiomatium orientale C. & R- (Mountain Parsley). Softly pubescent on 

 the peduncles ; rays of umbel unequal, 1-3 cm. long ; involucre wanting, involucels 

 of lanceolate, scarious-margined bracts ; fruit orbicular, glabrous. Moist moun- 

 tain slopes. 



