120b.  Dalea hintoni Sandwith var. subbijuga Barneby

(Plate CVIII)

Depressed, mat-forming shrublets, the suffruticose main stems trailing, up to 6-8 dm long, the slender, ascending, mostly monocephalous flowering branchlets little over 1 (1.5) dm long; main cauline leaves (drought-deciduous) up to 2 cm long, the 5-9 elliptic-oblanceolate leaflets mostly 3-6.5 mm long, the upper leaves (1) 3-5- foliolate; calyx 4.8-5.9 mm long. — Collections: 1 (o).

Open pine-forest, ± 1500 m, known only from Mina district in Sierra Madre del Sur, Guerrero. — Flowering January to March.

Dalea hintoni Sandw. var. subbijuga (with ± 2 pairs of leaflets) Barneby, var. nov., a var. hintoni foliolis minus numerosis, foliorum caulinorum majorum 2-4 (saepissime 2 et 3)-jugis, summorum tantum 1-2-jugis recedens. — Guerrero. Mina distr.: Petlacala to El Oro, Cruz-Quemada, Sierra Madre del Sur, January 13, 1939, Ynez Mexia 9103.— Holotypus, NY; isotypi, ARIZ, CAS, F, GH, K, RENNER, UC, US (2 sheets)!

Apart from the reduced number of leaflets, which must be regarded as its chief differential character, var. subbijuga differs from var. hintoni, in the few specimens seen, by its better developed main stems which become distinctly woody and trailing, apparently forming mats 1-1.5 m in diameter. The inflorescence and flowers of the two varieties are virtually identical.