PEA FAMILY 557 



monadelphous, 10 or 9. Ovary sessile or short-stipitate; ovules generally 2, rarely 4-6. 

 Pod rather short, often included in the calyx. [Name in honor of Thomas Dale, early 

 English botanist.] 



An American genus of approximately 150 species, extending from the Mississippi Valley and the south- 

 western United States to Mexico and the Andes. Type species, Dalea alopecuroid.es Willd. 



Plants herbaceous or the stems somewhat woody toward the base; leaves pinnate. 



Herbage villous-tomentose; flowers in dense spikes; corolla shorter than the densely long-villous calyx. 

 Calyx, including the lobes, 4-5 mm. long. 1. D. mollis. 



Calyx, including the lobes, 6-8 mm. long. 2. D. neomexicana mollissima. 



Herbage silky-canescent, with short appressed hairs; corolla well exceeding the silky calyx. 



3. D. Parryi. 

 Plants distinctly woody, becoming shrubs or small trees. 

 Leaves pinnate. 



Flowers in dense subcapitate spikes; corolla little exceeding the calyx, often pubescent; even the older 

 branches tomentose and glandular-dotted. 

 Glands rather sparse, small and prickle-shaped. 4. D. Emoryi. 



Glands abundant and conspicuous, flat. 5. D. polyadenia. 



Flowers in loose elongated spikes or spike-like racemes; corolla well exceeding the calyx, glabrous; 

 older branches glabrous. 

 Herbage tomentose; leaflets mostly ovate, often obliquely so. 6. D. arborescens. 



Herbage more or less silky-canescent with short appressed hairs. 



Leaflets decurrent on the flattened somewhat winged rachis, linear-lanceolate, densely silky. 



7. D. califomica. 



Leaflets narrowed at base and more or less petiolulate. 8. D. Fremontii Johnsonii. 



Leaves simple, sparse or often wanting in spinosa. 



Herbage green and nearly glabrous; leaflets very narrowly linear. 9. D. Schottii. 



Herbage silvery-silky; leaflets linear or linear-lanceolate, often wanting. 



10. D. spinosa. 



1. Dalea mollis Benth. Silky Dalea. Fig. 2760. 



Dalea mollis Benth. PI. Hartw. 306. 1848. 



Parosela mollis Heller, Cat. N. Amer. PI. ed. 2. 6. 1900. 



Stems herbaceous, branching from the base and spreading, 5-20 cm. long, soft-villous and 

 dotted with small flat brown glands. Leaves canescently soft-villous; leaflets 9-13, cuneate- 

 oblong to obcordate, 3-8 mm. long, dotted near the margin with flat brown glands ; inflorescence 

 a densely flowered spike 15-35 mm. long, each flower subtended by 2 gland-like persistent bracts; 

 calyx densely long-villous, 7 mm. long, the teeth filiform, about equaling the tube ; calyx 3-4 mm. 

 long, the corolla slightly longer or included, rose-colored; pod obovate, 3 mm. long, densely 

 hirsute, without glands. 



Sandy and gravelly soils, Lower Sonoran Zone; Colorado Desert, California, to Lower California, southwest- 

 ern Arizona, and Sonora. Type locality : collected by Coulter on his trip from Monterey to Yuma. March-June. 



2. Dalea neomexicana subsp. mollissima (Rydb.) Wiggins. Downy Dalea. 



Fig. 2761. 



Parosela mollissima Rydb. N. Amer. Fl. 24: 64. 1919. 



Parosela mollis var. mollissima Munz, Bull. S. Calif. Acad. 31 : 65. 1932. 



Dalea mollis var. mollissima Munz, Man. S. Calif. 263. 1935. 



Dalea neomexicana subsp. mollissima Wiggins, Contr. Dudley Herb. 3: 52. 1940. 



Prostrate or decumbent perennial herb, the stems numerous, 1-4 dm. long, densely silky- 

 pilose and glandular-dotted. Leaves 2-4 cm. long; leaflets 11-15, cuneate-obovate, 4-8 mm. long, 

 sparsely pilose or glabrate above, densely villous below ; racemes dense, 2-3 cm. long, becoming 

 twice as long in fruit; calyx-tube 3-3.5 mm. long, the lobes filiform-attenuate, 3.5-4.5 mm. 

 long, plumose-villous ; corolla white to rose, included in the calyx-lobes; blade of standard 

 orbicular-cordate, 2 mm. long, the claw about the same length ; pod 3 mm. long, villous. 



Sandy desert slopes and washes, Lower Sonoran Zone; Colorado Desert, southern California, to northern 

 Lower California and southwestern Arizona. Type locality: Las Vegas Wash, Nevada. March-May. 



3. Dalea Parryi Torr. & Gray. Parry's Indigo-bush. Fig. 2762. 



Dalea Parryi Torr. & Gray ex A. Gray, Proc. Amer. Acad. 7: 397. 1868. 

 Parosela Parryi Heller, Cat. N. Amer. PL ed. 2. 6. 1900. 



Perennial, the stems branching from the base, ascending, slender and often suffrutescent, 2-5 

 dm. high, strigose, dotted with small flat glands. Leaves pinnate with a slender rachis 2-4 cm. 

 long ; leaflets orbicular to elliptical, 2-4 mm. long, more or less sparsely strigose above, strigose 

 and dotted with flat glands beneath ; inflorescence a loosely flowered spike 3-5 cm. long ; calyx 

 3 mm. long, silky-canescent, the teeth ovate, equaling the tube; corolla blue and white, 6 mm. 

 long, the keel well exceeding the wings and banner ; pod gibbous, 2 mm. long, glandular. 



Gravelly soils, Lower Sonoran Zone; southeastern Mojave and Colorado Deserts, California, to southern 

 Nevada, Arizona, Sonora, and northern Lower California. Type locality: on the Colorado River near the mouth 

 of Williams River. Feb.-May. 



4. Dalea Emoryi A. Gray. Emory's Indigo-bush. Fig. 2763. 



Dalea Emoryi A. Gray, Mem. Amer. Acad. II. 5: 315. 1855. 

 Parosela Emoryi Heller, Cat. N. Amer. PI. ed. 2. 6. 1900. 



Intricately branched shrub, 1-2 m. high, the branches densely hoary-pubescent and rather 

 sparsely sprinkled with short reddish prickle-like glands. Leaves pinnate, similarly hoary- 



