618 FABACEAE 
subulate-lanceolate, mostly longer than the tube: corolla purplish, 5-6 mm. long: pods 
linear, about 2 cm. long, slightly curved, short-beaked. [Astragalus Nuttallianus DC. ] 
In dry soil, Arkansas and Texas to Arizona. Spring. 
4. Hamosa macilénta Small. Plant somewhat strigillose. Stems tufted, 1-1.5 dm. 
long, ascending: leaves 2.5-4.5 cm. long; leaflets 7-9, the blades linear, 9-12 mm. long, 
acute, sessile or essentially so: peduncles surpassing the accompanying leaves: calyx 
sparingly pubescent ; lobes subulate, the lower ones longer than the tube: corolla purplish, 
nearly 1 cm. long: pods linear, 2-2.5 cm. long, glabrous. 
On hillsides and prairies, near the Blanco, Texas. Summer. 
5. Hamosa austrina Small. Plant copiously strigillose. Stems branched at the 
base, the branches ascending or decumbent, 1-4 dm. long, mostly simple : leaves numerous, 
1.5-5 em. long; leaflets mostly 9-11, the blades oblong to oval, 2-6 mm. long, acute or 
blunt: racemes head-like, on slender peduncles 1-4 cm. long: calyx 4 mm. long, very . 
short-pedicelled ; tube densely pubescent ; lobes subulate-lanceolate, longer than the tube: 
corolla purplish, 5-6 mm. long: pods linear, 1.5-2 cm. long, strongly curved at the base, 
finely pubescent and very delicately reticulated. 
On plains and prairies, Texas to California and Mexico. Spring. 
23. HOLCOPHACOS Rydb. 
Perennial low spreading herbs. Leaves alternate, the stipules nearly free and distinct : 
leaflets numerous, the blades entire, mostly truncate or notched at the apex. Flowers 
perfect, few in short racemes. Calyx short-campanulate: lobes short, relatively broad. 
Corolla pink or purplish : standard with a broad deeply notched blade: wings slightly 
longer than the keel-petals. Stamens 10: filaments diadelphous: anthers alike. Ovary 
sessile. Ovules many. Pod linear or oblong, leathery, deeply sulcate along both sutures, 
but 1-celled, without even a partial partition. Seeds numerous. 
Calyx-lobes triangular: pods about twice as long as broad. 1. H. Engelmannii. 
Calyx-lobes lanceolate: pods 3-4 times as long as broad. 2. H. distortus. 
1. Holcophacos Engelmánnii (Sheldon) Rydb. Plant nearly glabrous. Stems 
branching at the base, the branches diffuse or procumbent, 8-35 cm. long, simple or branch- 
ing: leaves 3-15 cm. long; leaflets 15-25, the blades oblong to obovate, 3-7 mm. long, 
rounded or notched at the apex, short-stalked : peduncles surpassing the subtending leaves: 
racemes ovoid or oblong: calyx strigillose ; lobes triangular, shorter than the tube, more or 
less spreading: corolla purplish, about 1 cm. long: pods 1-celled, glabrous, 1-1.8 cm. long, 
about twice as long as broad. [Astragalus Engelmannii Sheldon. ] 
In dry soil, Texas. Spring and summer. 
2. Holcophacos distórtus (T. & G.) Rydb. Plant glabrous or sparingly pubescent. 
Stems branched at the base, the branches ascending or prostrate, 1-4 dm. long : leaves 
em. long; leaflets 17-23, the blades oval, obovate or cuneate, 3-10 mm. long, rounded or 
notched at the apex, short-stalked : peduncles about as long as the subtending leaves or 
longer: racemes ovoid or cylindric: calyx minutely pubescent ; lobes lanceolate, shorter 
than the tube, erect: corolla purplish blue, 8-10 mm. long: pods crescent-sha ed, 2-2.5 
em. long, 3 to 4 times as long as broad, short-beaked. [Astragalus distortus 1. 
In dry soil, lowa to West Virginia, Mississippi and Texas. Spring and summer. 
24. TIUM Medic. 
Perennial caulescent herbs, various in habit. Leaves alternate, the stipules nearly 
free and distinct: leaflets numerous, the blades entire. Flowers perfect, in short or 
elongated racemes. Calyx mostly campanulate : lobes nearly equal, sometimes relatively 
long. Corolla purple or ochroleucous, or white: standard with a relatively broad, some- 
times notched, blade. Stamens 10: filaments diadelphous: anthers alike. Ovary more 
or less distinctly stipitate. Ovules numerous. Pod narrow, more or less tapering at both 
ends, usually stipitate, membranous or rather firm, 1-celled, obcordate or triangular " 
cross-section, the ventral suture strongly sulcate and rarely with a narrow partial partition. 
Hs E pubescent. adeo a 
s glabrous. . 
Leaflets with obcordate blades: corolla less than 10 mm. long: pods reticulated. 2. T. kai dee 
Leaflets with linear blades: corolla over 10 mm. long: pods not reticulated. 8. T.a 
