Part 1, 1919] FABACEAE: PSORALEAE 33 



21. Amorpha arizonica Rydberg, sp. now 



A low shrub; branches softly villous, distinctly angled; leaves ascending, 1-1.5 dm. long; 

 petioles 1.5-2.5 cm. long, as well as the rachis finely villous-pilose; leaflets 13-19, oblong- 

 obovate or elliptic, 1-2 cm. long, 5-10 mm. wide, softly pubescent on both sides, rounded and 

 mucronate at the apex, mostly acute at the base; petiolules 1-2 mm. long; racemes usually 2 

 or 3 together, short-villous, 5-12 cm. long; calyx about 3 mm. long, minutely puberulent; 

 lobes very short, broader than long, the upper two rounded, the lower three acute; banner dark- 

 blue, about 5 mm. long, broadly cuneate-obovate. 



Type collected along streams, Ramsey Canon, Huachuca Mountains, Arizona, June 10, 1909, 

 Goodding 136 (herb. N. Y. Bot. Gard.). 



22. Amorpha occidentalis Abrams, Bull. N. Y. Bot. Gard. 6: 

 394. 1910. 



Amorpha frulkosa Torr. Bot. Mex. Bound. Surv. 53, in part. 1859. 



Amorpha californica Greene, Fl. Franc. 14. 1891. Not A. californica Nutt. 1838. 



A shrub, 2-3 m. high; branches minutely strigose, pubescent; leaves 1-2 dm. long, as- 

 cending; petioles 1.5-2.5 cm. long, as well as the rachis sparingly strigose; leaflets oval to ob- 

 long, sparsely strigose, firm, 2-4 cm. long, 1-2 cm. wide, usually rounded and mucronate at 

 the apex, acute at the base; petiolules often 2 mm. long; racemes solitary or 2-4 together, 1-2 

 dm. long, the rachis more or less pubescent; pedicels scarcely 2 mm. long; calyx 3 mm. long; 

 tube strigose to nearly glabrous; lobes densely villous, triangular, acute or the upper obtuse, 

 the upper two broader and the lowest one slightly longer; banner dark-blue, about 5 mm. long; 

 pod 6 mm. long, 2.5 mm. broad, somewhat curved on the back, with conspicuous glands on 

 the upper half. 



Type locality: San Diego River, near Old San Diego Mission, southern California. 

 Distribution: New Mexico to southern California. Chihuahua, and Sonora. 

 Illustrations: C. K. Schneid. Handb. Laubh. 2:/. 42, n-p; f. 44, c-c- (all as A. californica). 



23. Amorpha fragrans Sweet, Brit. Fl. Gard. pi. 241. 1828. 



Amorpha fruticosa angustifolia Pursh, Fl. Am. Sept. 466. 1814. 



Amorpha nana Sims, Bot. Mag. pi. 2112. 1819. Not A. nana Nutt. 1813. 



? Amorpha Lewisii Lodd.; Loud. Hort. Brit. 283; hyponym. 1830. 



Amorpha fruticosa Lewisii Loud. Arb. 2: 607. 1838. 



Amorpha fruticosa var. [2] A. Gray, Bost. Jour. Nat. Hist. 6: 174. 1850. 



Amorpha fruticosa Coult. Man. 59, mainly. 1885. Not A . fruticosa L. 1753. 



Amorpha angustifolia F. Boynton, Biltmore Bot. Stud. 1: 139. 1902. 



A branching shrub, 1-3 dm. high; branches finely strigose-canescent ; leaves 7-20 cm. long; 

 petioles 1-2 cm. long; leaflets 9-27, elliptic to linear-oblong, 2-4 cm. long, acute at the base, 

 acute to rounded and mucronate at the apex, minutely strigose on both sides; racemes mostly 

 clustered, 5-15 cm. long; pedicels 1-2 mm. long; calyx 3-3.5 mm. long, sparingly minutely 

 puberulent, soon glabrate, except the ciliolate lobes; upper two lobes rounded, 0.5 mm. long, 

 the lower three triangular, acute, the lowest one slightly longer; banner broadly obovate, 

 4.5-5 mm. long, 2.5 mm. broad, strongly curved, conspicuously glandular-dotted; seed oblong- 

 lunate, 3.5 mm. long, brown, shining. 



Type locality (of A. nana Sims, on which .4. fragrans was based): Grassy hills of the Mis- 

 souri [River]. 



Distribution: Illinois to Montana. Chihuahua, and Texas. 



Illustrations: Bot. Mag. pi. 2112; Sweet. Brit. Fl. Gard. I 3 : pi. 241; Loud. Arb. /. 303; C. 

 K. Schneid. Handb. Laubh. 2:/. 44, h-m; f. 45, f-h; Clements, Rocky Mt. Fl. pl.29,f. 5 (asA. fruti- 

 cosa) . 



Excluded and doubtful species 



Amorpha luTEa Raf. Fl. Ludov. 105. 1817. Indeterminable, but apparently does not 

 belong to the genus. 



Amorpha RabiaE Lex.; Llave & Lex. Nov. Veg. Descr. 1 : 22. 1824. This was described 

 from specimens collected on the peak of Quinceo, near Valladolid [Morelia, Michoacan]. No 

 species of A morpha is known from Mexico except in the far northern part. From the descrip- 

 tion it seems probable that the plant belonged to that genus and would be distinguished from 

 the known species by its ovate, acute, tomentose leaflets and its calyx-lobes, which are all 

 obtuse. 



