LEGUMINOSAE (PULSE FAMILY) 517 



13. A. dist6rtus T. & <;. Low, diffuse, many-stemmed, subplabrous ; leaflets 

 17-25, obloiiir, eniarijinate ; flmrvrs 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., and Tex. 



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

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

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

 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 l-celled, neither suture being inflexed or the ventral more intruded 



than the aortal. 



* Pod sessile in the calyx valves strongly convex. 



15. A. neglctus (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, 1.21.8 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. flexudsus Dougl. Ashy-puberulent, ascending, 3 to 6 dm. high ; leaf- 

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

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

 very shortly stipitate. Slinn. to Col., and northw. 



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. americanux Gray ; A. elegans Britton, 

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



* * Pod slender-stiped ; valves flatfish. 



18. A. tenSllus 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. 



38. 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 <5ys, sharp, and T/xSiris, keel.} 

 SPIESIA Neck. ARAGALLUS Neck. 



* Leaves simply pinnate. 



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

 lets lanceolate or oblong ; flowers showy, rose-colored, dry ing 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. Lamb6rti 1'ursh. ,SY/A\v irith fine appressed hairs ; leaflets mostly 

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

 or flrm-coriafi-otis in texture, silky-pubescent, strictly erect, cylindraceous- 

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



