TABLE 1 in Cotyledon mckayi (Crassulaceae subfam. Kalanchooideae), a new cremnophytic species from the central Tugela River Basin of KwaZulu-Natal, South Africa

TABLE 1. Characters on which Cotyledon mckayi can be distinguished from C. barbeyi, C. orbiculata var. oblonga, and C. nielsii (based on both literature and specimen data). “ C.” = “ Cotyledon ”.
#CharacterC. mckayiC. barbeyiC. orbiculata var. oblongaC. nielsiiA.Vegetative1.Plant height (m)0.45–0.75(–1.6)1–2(–4)0.80.25–0.5(–0.9)2.Leaf blade dimensions (mm)(120–)130–200 × 17–30(40–60–120(–160) × (10–)20–45(40–)50–110(–140) × (10–)35–60(–80)45–65 × 32–383.Leaf shapeLinear-lanceolate when young, elongate-obovate to narrowly cymbiform at maturityOblanceolate to linearObovate to oblanceolate, rarely narrowly oblong to tereteOvate to elliptic4.Leaf colourGrey-green, with purplish infusionGreen to greyish brownDeep green to grey, usually with red margin particularly at apexGreen5.Leaf bloomWaxyAbsentSometimes thick waxyAbsent6.Leaf vestitureGlabrousGlabrous to glandularpubescentUsually glabrous, rarely lightly hairyPuberulous with translucent to purpleinfused hairs7.Leaf petiolesnonenonenonepresent, 15–17 mm longB.Reproductive8.Peduncle height (mm)300–350200–350(600)(150–)200–350(–450)150–2009.Waxy bloom on corollaPresentAbsentOften presentAbsent10.Sepal vestitureGlabrousDensely covered with glandular hairsUsually glabrous, sometimes hairyPuberulous11.Corolla colourReddish orangeOrange to deep redOrange to redReddish-orange, greenish at base when shaded12.Corolla vestiture (outside)GlabrousGlabrous to densely covered with glandular hairsGlabrousPuberulous13.Corolla tube length (mm)(10–)13–1414–16(–18)(18–)20–2511–1214.Corolla tube shapeSubcylindrical to slightly urceolateAmpullaceous, bulging between calyx lobesCylindrical but bulging slightly in the middleSubcylindrical, widest at the base15.Corolla lobe length (mm)10–1216–17(8–)10–13(–15)1116.Nectar scale shapeSquarish, erecto-patentOblong, with cupshaped depression on apexTransversely oblong to almost squareHemispherical, forming a near-patent basin-like structure17.Nectar scale dimensions (mm)1.5 × 1.5(2.5–)3–4.5 × 1.2–1.80.4–0.9 × 1.0–1.51.5 × 1.518.Flowering periodJune–AugustMay–AugustJune–September (October)July–September