Dalea melantha S. Schauer

Parosela melantha (S. Schauer) Rydberg
Dalea melantha S. Schauer, Linnaea 20: 746. 1847.
A shrub; stem erect, glabrous, sparingly glandular-dotted, blackening in drying; leaves 1-2 cm. long, spreading; stipules subulate, 2 mm long; rachis sulcate, glabrous; stipels conic, fleshy; leaflets 7-13, cuneate, usually emarginate or retuse, 2-4 mm. long, glabrous on both sides, conspicuously glandular-dotted beneath, blackening in drying; peduncles 2-5 cm. long; spikes oblong, 1-4 cm. long; bracts ovate-lanceolate, acuminate, ciliate at the base and along the margins black, glabrous on the back, at least at the tip; calyx-tube campanulate-turbinate 2-3 mm. long, strongly 10-ribbed, pilose, with a row of glands between the ribs; lobes filiform from a triangular base, plumose, longer than the tube; corolla yellow, turning almost black in drying; blade of the banner 3 mm. long, cordate, usually with a gland at the tip, the claw 2-3 mm. long; blades of the wings 4 mm., those of the keel-petals 5 mm. long, the claws of both 1.5 mm. long; pod villous-pilose above, glabrous towards the base.
Type locality: State of Oaxaca.
Distribution: Veracruz and Hidalgo to Oaxaca.

Parosela fuscescens Rydberg, sp. nov
A shrub, probably 1 m. high or more; branches glabrous, leafy; leaves 1-2 cm. long; stipules subulate, persistent, 1-2 mm. long; rachis glabrous; stipels conic, gland-like; leaflets 5-11, oblong-obovate, often retuse, 4-6 mm. long, glabrous on both sides, glandular-dotted beneath; spikes terminal, dense, 1.5-2.5 cm. long, 1 cm. thick, short-peduncled ; bracts lanceolate, pilose and glandular, acute; calyx-tube campanulate, 3 mm. long, 10-ribbed, pilose, conspicuously glandular-dotted in the intervals; lobes filiform from a broad base, 4 mm. long, plumose; corolla yellow, the petals usually with a large gland near the tip; blade of the banner broadly rhombic-ovate, 4 mm. long, the claw 3 mm. long; blades of the wings 5 mm. long, those of the keel-petals broader, 6 mm. long, with a smaller reflexed basal lobe; pod densely and finely pilose above, glabrous below.
Type collected in Coahuila, in 1880, Edward Palmer 209 (U. S. Nat. Herb. no. 24309).

Dalea melantha là một loài thực vật có hoa trong họ Đậu. Loài này được S.Schauer miêu tả khoa học đầu tiên.