1 Stems and branches many from the base of the plant; deltoid prickles (0.1-0.5 mm long) along the leaf blade midvein usually absent or 1-2 at the blade base; terminal inflorescence typically with 15-30 flowers; base of calyx ca. 1 mm wide; corolla tube 1.25-2.5 mm long; corolla limb (2.2-) 2.5-4.5 mm wide; corolla lobe ca. 1.5 mm wide at base, ca. 2 mm long; stamen exserted to 1.5-2 mm beyond tube apex (base of lobe); anthers 0.5-1 mm long; ovary (1.4-) 2-3.5 mm long, 1.0 mm wide; fruit (including persistent calyx lobe) 2.5-4 mm long