55 
Fruit wings narrow (less than half as broad as body). 
Plant puborulent: Isallets linear, elongated (2 to 4 
ixiches) ( r ^ ^ (’if *^4 
Plant glabrous: leaflets linear, short (3 to 9 lines). . ..... lavigatum, 35 
Plant glabrous: leaflets thickish, lanceolate to ovate leiocarpum, 37 
Fruit-wings from half to as broad as body. 
Fruit small (2 to 4 lines): involucels much dilated utriculalum, 28 
Fruit larger (4 to 8 lines): involucels linear-subulate Grayi, 10 
Fruit very large (9 to 14 linesi Stiksdorfii, 40 
Fruit- wings much broader than body. 
Leaves ternate, with linear or narrow leaflets simplex, 33 
Leaves with broad laciniately-toothed leaflets. 
Leaflets broadly cordate, somewhat lobed Euryptera, 41 
Leaflets ovate, obtuse, with divaricate cuspidate 
t^igth purvifoUum, 43 
Leaves pinnately decompound. 
Plant glabrous .Martindalel, 20 
.Plant pubescent Vaseyi, 27 
Oil-tubes numerous. 
Fruit emarginate, with wings broader than body HowelUi, 42 
Fruit- wings half as broad as body. 't '' 
Plant villous to sparsely tomentose. 
Fruit pubescent • • • .villosuni, 20 
Fruit glabrous fceniGidaceum, 9 
Plant glabrous. 
Involucels conspicuous caruifolium, 29 
Involucels of few setaceous bractlets. 
Leaves ternate: pedicels aline long ' Brandegei, 39 
Leaves pinnate: pedicels 3 or 4 hnes long Hallii, 24 
Fiuit- wings less than half as broad as body. • 
Plant puberulent or pubescent. 
Fruit glabrous microcarpum, 23 
Fruit puberulent. 
Petioles dilated with conspicuous white scarious 
margins Sandbergii, 22 
Petioles not searious-margined. v 
Plant 6 to 8 inches high: fruit 3i to 44 lines long Parryi, 18 
High alpine, f to 2 inches high: fruit 2 lines 
long ■ Oregatmm, 1 9 
Plant glabrous. 
Leaflets elongated-linear Kingii, 36 
Leaflets ovate to orbicular Nuttallii, 38 
Leaves pinnately decompound, with small segmeiats . . . Donnellii, 21 
