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

1 Stems single or many (especially when mowed) from the base of the plant, typically few to unbranched in the basal ½ of the plant; deltoid prickles (0.1-0.5 mm long) along the leaf blade midvein present throughout the blade; terminal inflorescence typically with 30-115 flowers; base of calyx ca. 0.5 mm wide; corolla tube 0.6-1.0 mm long; corolla limb 1.3-2.2 mm wide; corolla lobe ca. 1 mm wide at base, < 1.5 mm long; stamens exserted to 1.5 mm beyond tube apex (base of lobe); anthers <0.6 mm long; ovary 1-2 mm long, 0.7 mm wide; fruit (including persistent calyx lobe) 2-2.5 mm long