LEGUMINOSAE (PULSE FAMILY) 517 



13. A. dist6rtus T. & G. Low, diffuse, many-stemmed, subglabrous ; leaflets 

 17-25, oblong, ernarginate ; flowers in a short spike, pale purple ; pod ovate- or 

 lance-oblong, curved, 1.2-1.8 cm. long, glabrous, thick-coriaceous, somewhat 

 grooved on the back, the ventral suture nearly flat. " W. Va." and Miss, to 

 111., la., arid Tex. 



14. A. lotiflbrus Hook. Hoary or cinereous with appressed hairs ; stems very 

 short ; leaflets 7-13, lance-oblong ; flowers yellowish, in few-flowered heads, with 

 peduncles exceeding the leaves or very short ; calyx campanulate, the subulate 

 teeth exceeding the tube ; pod oblong-ovate, 1.8-2.4 cm. long, acuminate, acute at 

 base, canescent, the back more or less impressed, the acute ventral suture nearly 

 straight. Man. to Mo. (Bush}, Tex., and B. C. 



2. Pod 1-celled, neither suture being inflexed or the ventral more intruded 



than the dorsal. 



* Pod sessile in the calyx ; valves strongly convex. 



15. A. neglSctus (T. & G.) Sheldon. Nearly smooth, erect, 3-6 dm. high; 

 leaflets 11-21, elliptical or oblong, somewhat retuse, minutely hoary beneath ; 

 flowers white, rather numerous, in a short spike ; calyx dark-pubescent ; pod 

 coriaceous, inflated, ovoid-globose, 1.2-1.8 cm. long, acute, glabrous, slightly sul- 

 cate on both sides, cavity webby. (A. Cooperi Gray.) Cliffs and clayey banks, 

 e. Que. (according to Macoun) ; Ont., and w. N. Y. to Minn, and la. 



16. A. flexubsus Dougl. Ashy-puberulent, ascending, 3 to 6 dm. high ; leaf- 

 lets 11-21, mostly narrow ; flowers small, in loose racemes ; pod thin-coriaceous, 

 cylindric, 1.6-2.2 cm. long, 4 mm. broad, pointed, straight or curved, puberulent, 

 very shortly stipitate. Minn, to Col., and north w. 



17. A. euc6smus Robinson. Decumbent, ashy-puberulent, 3-6 dm. high ; 

 leaflets 13-15, oblong, 1.2-2.8 cm. long, glabrous above ; long-peduncled racemes 

 at length loose ; flowers small, pale blue or purple ; pod sessile, ovate-oblong, 

 strongly compressed. (A. oroboides, var. americanus Gray ; A. elegans Britton, 

 not Bunge.) Gravelly banks, Lab. to n. Me. ; Rocky Mts. 



* * Pod slender -stiped ; valves flattish. 



18. A. ten611us Pursh. Slender, decumbent, branched from the base, 2-4 dm. 

 high; leaflets 11-15, narrowly oblong to linear, obtuse, pale green; racemes 

 axillary, short-peduncled ; flowers small, 7-9 mm. long ; petals ochroleucous, 

 sometimes pink-tinged ; pod lance-oblong, 1-1.2 cm. long, thin. (A multiflorus 

 Gray ; Homalobus tenellus Britton.) Dry sandy plains, w. Minn, to N. Mex. 

 and B. C. 



33. OXYTROPIS DC. 



Keel tipped with a sharp projecting point or appendage ; otherwise as in 

 Astragalus. Pod often more or less 2-celled by the intrusion of the ventral 

 suture. Our species low nearly acaulescent perennials, with tufts of numerous 

 very short stems from a hard and thick root or rootstock, covered with scaly 

 adnate stipules ; pinnate leaves of many leaflets ; peduncles scape-like, bearing 

 a head or short spike of flowers. (Name from 6&s, sharp, and rp6iris, keel.) 

 SPIKSIA Neck. ARAGALLUS Neck. 



Leaves simply pinnate. 



1. 0. camp6stris DC., var. johannSnsis Fernald. Villous, 3-5 dm. high ; leaf- 

 lets lanceolate or oblong ; flowers showy, rose-colored, drying purplish-blue ; pods 

 2-2.5 cm. long, ovate- or oblong-lanceolate, thin and papery. (Var. caerulea 

 Man. ed. 6, not Koch ; Spiesia campestris Britton, in part ; Aragallus johan- 

 nensis Rydb.) Gravelly shores, Gaspe" Co. to Isle of Orleans, Que., s. to the 

 Restigouche R., N. B., and the Aroostook R., Me. 



2. 0. Lamblrti Pursh. Silky with fine appressed hairs; leaflets mostly 

 linear ; flowers larger, purple, violet, or sometimes white ; pods cartilaginous 

 or firm* coriaceous in texture, silky-pubescent, strictly erect, cylindraceous- 

 lanceolate and long-pointed, almost 2-celled by intrusion of the ventral sutura 



