LEGUMINOSAE (PULSE FAMILY) 517 



17 l^p;* ^A^^^^^'^^s ^: ^,^- ^Low, diffuse, many-stemmed, sub^labrous ; leaflets 

 17-26, oblong, emargmate ; flowers in a slwrt spike, pale purple; pod ovale or 

 lance-oblong curved, 12-1.8 cm. long, glabrous, thick-coriSceoul somewhat 

 grooved on the back, the ventral suture nearly flat.-- VV. Va." and Misl to 

 xii>, la*, anci lex. 



.\.}t' f iPt'^^V? ?°''^- Hoary or cinereous with appressed hairs; stems very 

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

 peduncles exceedmg the leaves or very short ; calyx cLpLulate theTihZate 

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

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

 straiglit. — Man. to Mo. (Bush), Tex., and B. C. "taiiy 



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



than the dorsal. 

 * Pod sessile in the calyx ; valves strongly convex. 

 1 l^ -^-^^fSlectus (T. & G.) Sheldon. Nearly smooth, erect, 3-6 dm. hi-h • 

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

 flowers white, rather numerous, in a short spike ; calvx dark-pubescent • vod 

 coriaceous, inflated, ovoid-globose, 1.2-1.8 cm. long, acute, glabrous, sliahtly 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. flexu5sus Dougl. Ashy-puberulent, ascending, 3 to 6 dm. h'gh • leaf- 

 lets 11-21, Diostly narrow ; flowers small, in loose racemes; pod thin-coriaceous, 4, 

 cylmdric, 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 • 

 ^aflets 1.3-15, oblong, 1.2-2.8 cm. long, glabrous above ; long-peduncled racemes 

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

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

 not Bunge.) —Gravelly banks. Lab. to n. Me. ; Eocky Mts. ' 



* * 



Pod slender-stiped ; valves flattish. 



18. A. ten§llus 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. Max. 

 and B. C. 



33. OXtTROPIS 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 d^vs, sharp, and rpdiris, keel.) 

 Spiesia Neck. Aragallus Neck. 



* Leaves simply pinnate. 



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

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

 2-2. b cm. long, ovate- or oblong-lanceolate, thin and papery. (Var. caornlea 

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

 nensis Rydb.) — Gravelly shores, Gasp6 Co. to Isle of Orleans, Que., s. to the 

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



2. 0. Lamb6rti 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 suture 



