Dry or (seasonally) moist hillsides, 2130-2400 m, apparently local, known only from the Pacific slope of the Peruvian Andes in s. Cajamarca and La Libertad, and (perhaps in a distinct phase) inland in the latter Department to the upper Maranon valley in province Pataz (Huaylillas to Tayabamba).— Flowering May and June, doubtless later. —Material. Cajamarca. Hualgayoc: phototypus. La Libertad. Otuz- co: Lopez, Sagastegui & Sanchez 3673 (US). Pataz: Lopez & Sagastegui 3418 (US).

Dalea cylindrica Hood var. sulfurea (Ulbr.) Barneby, stat. nov., based on D. sulfurea (sulfur-yellow, of the petals) Ulbr., Feddes Repert. 2: 5. 1906. — "Peruvia: Infra San Miguel in Departimento Cajamarca Hualgayocae provinciae...( A. Weberbauer legit 5. Maio 1904.. .no. 3922)." — Holotypus, formerly B, survives as Field Neg. 735, F, NY, US! — Parosela sulfurea (Ulbr.) Macbr., Field Mus., Bot. 4: 104. 1927.

The typus of D. sulfurea was collected at early anthesis and the spikes are therefore atypically short, the axis not much over 1 cm long. The lack of anthocyanin in the petals combined with loosely pubescent foliage are the weak differential characters on which I maintain the entity as distinct. The pubescence is certainly longer than in any known phase of var. cylindrica, but only a trifle denser. The collection from the transmontane slope in La Libertad has the long spike of var. cylindrica, the yellow petals of var. sulfurea, but a calyx pubescent externally from base upward. The material is as yet too scanty to reveal the full range of variation and the present disposition of what we do have is inevitably provisional. The affinity of D. sulfurea was not at all understood by Ulbrich, who compared it with D. mutisii (= D. coerulea var. coerulea). Macbride (1927, I.e.) disagreed with Ulbrich on this point, but found no closer relative.