DEBILES 3. 



Pods nearly sessile or shortly stipitate, papery (chartac- 

 eous in A. leptalens), inflated, completely 1-eelled, and with 

 dorsal suture not at all intruded, nigrescent, becoming gla- 

 brous with age, about straight but oblique, nearly half -oval to 

 half-ovate or narrowly oblong, but little flattened laterally 

 if at all (decidedly flattened in A. Bourgovii), cross-section 

 nearly round, not sulcate or only flattened dorsally (some- 

 times sulcate in leptaleus and Bourgovii). Ventral suture 

 about straight and tip not declined (except possibly in A. po- 

 laris), dorsal suture the more arched. Flower 7-12 mm. long, 

 few or in heads. Calyx tube nigrescent, cleft deeper above, 

 hyaline, campanulate, 2-3 mm. long, narrowed below, the 

 teeth subulate and nearly as long as the tube. Petals rather 

 broad and short-clawed. Keel purple-tipped. Peduncles 

 long and filiform. Bract green and lanceolate, a little longer 

 than the pedicels, small and short. Leaflets thin and flat. 

 Stipules large, connate at least below, green. Stems slender, 

 perennial, flexuous, weak, with slender internodes and weak 

 and narrow leaves, spreading over the ground, from rather 

 slender roots and much divided crowns from fleshy or woody 

 roots. This section would seem to belong to the Inflati but 

 all its relatives are here. A. vaginatus Pall, referred to in 

 Hooker's Fl. Bor. Am. 1 149 in which the description of Pal- 

 las is quoted would naturallj^ come here, but that species is A, 

 versicolor, while the plant of Richardson (on which Hooker 

 bases A. vaginatus) and which Sheldon calls A. Richardsoni 

 is A. Bourgovii probably. A. versicolor does not grow in 

 America. 



KEY 



A. Pods larne, oval-oblong, 3-5 cm. long, greatly inflated, not reflexed, 

 single or few at the ends of filiform peduncles. Roots not woody. 



Arctic plants. 26 polaris. 



2A. Pods small, not over 1.5 cm. long, somewhat inflated, the cross, 

 section inclined to be ovate, on a minute stipe, or short, few at 

 the ends of the filiform peduncles. 

 2AB. Pods apparently sessile or on a scarcely noticeable stipe, 

 oblique, broad. Flowers capitate when in bloom. 

 Leaves petioled, rather few. Leaflets 3-5 pairs. Wet meadows 27 debilis. 

 Leaves sessile., very many. Leaflets 6-S pairs. Arctic. 28 Yukonis. 

 2A2B. Pods distinctly stipitate, little oblique, narrow, mostly sul- 

 cate dorsally. Leaves all petioled. 

 Stipe 2 mm. long. Calyx 3-4 mm. long. Pods sharp at both ends. 



Peduncles shorter than leaves. Pedicels longer than bracts. 29 Bourgovii. 

 Stipe about I mm. long. Peduncles longer than leaves. Pedicels 

 not longer then bracts. Pods acutish only. 30 leptaleus. 



