TABLE 1 in Re-instatement of Craterostigma nanum (Linderniaceae) from the Pondoland Centre of Floristic Endemism and key to the South African species

TABLE 1. Comparison of Craterostigma plantagineum (Fischer 1992) and C. nanum (major differences in italics under the latter).
CharacterC. plantagineumC. nanumScape length (mm)(20–)40–60(–100)(30–)40–50(–70)LeavesshapeBroadly ovateLanceolate to oblanceolateveinsProminentIndistinctupper surfaceGlabrous or slightly hairy, no pitsGlabrous, pitted, slightly fleshylower surfaceAlways hairy, sometimes purpleGlabrous, sparse hairs on midveinLength (mm)(10–)35–80(–100)(17–)20–25(–30)Width (mm)(10–)20–40(–60)(5–)8–12(–15)Racemenumber of flowersUp to 5–6Up to 10pedicel length (mm)5–71–2CorollaSurfaceGlandular-pubescent outside on upper part of tube and base of upper lipGlabrous, hairs in throatColourMainly blue with white marginsMainly white (rarely flushed pale pink/ violet), small violet markings in throattube length (mm)77–8upper lip length (mm)6–75–6upper lip width (mm)5–65–6(–7)lower lip length (mm)6–7(–9)(5–)6–7(–9)lower lip width (mm)12–1511–13(–15)FilamentsPosticous, length (mm)1.5–2.01.5–2.0anticous arch, length (mm)7–8, without appendages2–4(–5), with appendagesStylelength (mm)8–9(5–)6–8(–10)BractshapeOvate-lanceolateLanceolatehairinessSparsely hairy on prominent mid-veinSparsely hairy outsidelength (mm)10(7–)8–11(–13)Width (mm)(1.5–)2–4(–5)(4–)5–6(–9)Calyxlength (mm)66–8teeth tipAttenuateAttenuateteeth length (mm)11–2hairinessSparsely hairy outside, especially on veinsSparsely hairy outside, teeth tips sometimes purpleFruitlength (mm)116.5RootsOrange redYellowishDistributionWidespread in high lying areas in Gauteng, Limpopo, Mpumalanga, and North WestPondoland Centre of Floristic EndemismLocalityDisturbed and undisturbed areasUndisturbed areasElevation (m)800–3100(60–)200–450SubstrateGranite, gneissMsikaba Sandstone Formation