Monographs Details: Piptocarpha opaca subsp. piraparanaensis G.Lom.Sm.
Smith, Gerald L. & Coile, Nancy C. 2007. (Compositae: Vernonieae). Fl. Neotrop. Monogr. 99: 1--94. (Published by NYBG Press)
Description:Subspecies Description - Leaves with petioles furrowed, cinereous-tomentose 5-10 mm long; blades usually small 5-8.5 x 2-3 cm, with 4-7 lateral veins on each side. Inflorescences axillary, hemispheric clusters of 7-9 heads. Heads of 6-8 florets, subsessile; involucre turbinate 7.5 -8 x 3-4 mm.
Discussion:Subspecies piraparanäensis is distinguished from subsp. opaca by its smaller, oblong or elliptic leaves and smaller heads vs. the larger, ovate leaves and larger heads of subsp. opaca.
Vaupés Colombia South America