Part 5, 1929] FABACEAE: GALEGEAE 253 



or purplish. Banner obovate or oval, retuse, rather strongly arched. Wings shorter, falcate, 

 the blade broadly oblanceolate, longer than the claw, with a large reflexed auricle. Keel- 

 petals still shorter, the blade about equaling the claw, broadly lunate, acutish or obtuse at 

 the apex, auricled at the base. Stamens diadelphous (9 and 1), the sheath arched above. 

 Pod ovoid, somewhat compressed, acute at least on the upper suture, few-seeded, indehiscent. 

 Seeds obliquely reniform, with a deep-seated hilum. 

 Type species, Kenlrophyta montana Nutt. 



Stipules connate only at the very base, distinctly spinulose-tipped, or partly 

 green. 

 Pod about 1 cm. long; stem 1-2 dm. high, densely eanescent. 1. K. coloradensis. 



Pod 4—7 mm. long; stem less densely pubescent. 



Stem 2-4 dm. long, usually rather simple; stipules decidedly spinulose- 

 tipped; pod lanceolate in outline, 6-7 mm. long. 2. A", impensa. 

 Stem 1-2 dm. long, much branched; stipules partly green, with a rather 



weak tip; pod ovate, 4 mm. long. 3. A.", viridis. 



Stipules decidedly connate below, scarious, not spinulose. 



Leaflets linear-filiform to subulate, not narrowed towards the base; pod 



ovate, compressed. 4. K. montana. 



Leaflets linear-lanceolate or oblanceolate, distinctly narrowed towards the 

 base. 

 Pubescence of the stem and leaves strictly appressed, strigose; pod 

 rather turgid, lanceolate to oblong-ovate. 

 Leaves almost silvery-white on both sides; pod lanceolate. 5. K. ungulata. 



Leaves grayish-strigose beneath, glabrate above; pod lance-ovoid. 6. K. rotunda. 



Pubescence of the stem and leaves looser, the hairs mostly ascending; 

 pod broadly ovate or oval. 

 Corolla 3-5 mm. long, ochroleucous, usually with purple-tipped keel; 

 leaflets less than 5 mm . long. 

 Flower-clusters very short-peduncled or subsessile; calyx -lobes 

 shorter than the tube. 

 Leaves short-hairy; stipules with long spreading tips. 7. K. minima. 



Leaves long-hairy; stipules without long tips. 8. K. Wolfti. 



Flower-clusters on peduncles equaling or exceeding the leaves; 



calyx-lobes equaling or exceeding the tube. 9. A.', legetaria. 



Corolla 5-7 mm. long, purple; leaflets more than 5 mm. long. 10. K. aculeata. 



1. Kentrophyta coloradensis (M. E. Jones) Rydberg, sp. nov. 



Astragalus Kenlrophyta coloradensis M. E. Jones, Contr. W. Bot. 10: 63. 1902. 

 Astragalus montanus coloradensis M. E. Jones, Rev. Astrag. 80. 1923. 



A perennial, with a cespitose caudex; stems bushy, branched, 1-2 dm. long, terete, densely 

 canescent-strigose; stipules nearly free, subulate, with a lanceolate base and a spinulose tip, 

 3-6 mm. long; leaves spreading, with a strong midrib, strigose, spinulose-tipped, 8-15 cm. 

 long, about 1 mm. wide; flowers unknown; pod obliquely lanceolate, about 1 cm. long and 

 4 mm. wide, gradually tapering to the apex, white-strigose, the beak 2-3 mm. long; seeds 2, 

 brown, about 3 mm. long and 2 mm. wide. 



Type locality: Lee's Ferry, Arizona. 



Distribution: Known only from the type locality. 



Illustrations: M. E. Jones, Rev. Astrag. pi. 5; Contr. W. Bot. 10: pi. 1. 



2. Kentrophyta impensa (Sheldon) Rydb. Bull. Torrey Club 



32: 665. 1906. 



Astragalus Kentrophyta elatus S. Wats. Bot. King's Expl. 77. 1871. 

 Astragalus viridis impensus Sheldon, Minn. Bot. Stud. 1: 118. 1894. 

 Astragalus viridis elatus Cockerell. Bot. Gaz. 26: 437. 1898. 

 Astragalus Kentrophvta impensus M. E. Jones, Contr. W. Bot. 10: 63. 1902. 

 Astragalus impensus Wooton & Standley. Contr. U. S. Nat. Hist. 19: 369. 1915. 

 Astragalus montanus impensus M. E. Jones, Rev. Astrag. 80, 1923. 



A perennial, with a cespitose caudex; stems terete, branched at the base and otherwise, 

 striate, terete; stipules united and scarious at the base, partly green and with a strong midrib 

 ending in a rather stiff spinulose tip, 6-10 mm. long; leaves spreading, 1.5-2 cm. long; leaflets 

 usually 5, linear-subulate, with a strong midrib, strigose, spinulose-tipped, 8-15 mm. long, 

 1-2 mm. wide; peduncles 5 mm. long or less, usually 2-flowered; calyx strigose, the tube 1.5 

 mm. long, the lobes subulate, 1 mm. long; corolla ochroleucous, 4 mm. long; pod strigose, 



