Jacobsenia kolbei
Jacobsenia kolbei in Kakteen And. Sukk. 5. 1954 sec. Klak & al. 20181 wfo-0001293239
- ≡Mesembryanthemum kolbei in Ann. Bolus Herb. 3: 131. 1922 syn. sec. Klak & al. 20181 wfo-0001038717
- ≡Drosanthemum kolbei in Natl. Cact. Succ. J. 33: 8. 1978 syn. sec. Klak & al. 20181 wfo-0000656929
- Type: "South Africa, Western Cape, Vanrhynsdorp (3118 BC), Oct. 1917, <i>Kolbe sub NBG 2388/17</i> (BOL, holo!)" [fide Klak & al. 20182]
- 1. Klak, C., Hanáček, P. & Bruyns, P. V. 2018: A recircumscription of Jacobsenia (Aizoaceae): Re-instating Drosanthemopsis, with two new quartz-endemics from Namaqualand, South Africa and sinking Knersia. – South African Journal of Botany 116: 67-81, 2. Klak, C., Hanáček, P. & Bruyns, P. V. 2018: A recircumscription of Jacobsenia (Aizoaceae): Re-instating Drosanthemopsis, with two new quartz-endemics from Namaqualand, South Africa and sinking Knersia. – South African Journal of Botany 116: 67-81
Diagnosis
Jacobsenia kolbei is well characterized by its clump forming habit with erect long flowering shoots. The epidermis of the leaves is covered with large, polygonal cells, with smooth outer walls. The flowers are almost always white (the rare colour of cerise was recorded on the specimen Bean 1281, BOL) and are smaller (53–60 mm diam.) than those of J. hallii (80–85 mm diam.).A
Description
Sparsely branched shrubs to 50 cm high, young plants caespitose, adult plants compact with erect shoots with elongated internodes (long shoots) and short lateral shoots with very short internodes; short shoots developing 2 leaf-pairs per season, long shoots developing more leaf-pairs; leaf-pairs often slightly anisophyllous. Leaves often distinctly curved, erect or spreading, mostly terete, 22–60 mm long, 7–10 mm diam., mostly smaller on short shoots; epidermis with large, usually elliptic to polygonal bladder cells. Flowers on erect long shoots only, emerging from the connate portion of the 2nd leaf-pair of the season, 53–60 mm diam., pedicels 25–70 mm long; sepals 5 (rarely 4), spirally arranged; petals white (rarely cerise); filaments white. Fruit shape of capsule seen from above 5-angled, 7–11 mm diam, 5 locules, rarely 6.A
Phenology
Flowering occurs from July to August.A
Citation
Ihlenfeldt, H.-D. 2017: Dicrocaulon, Diplosoma, Jacobsenia, Meyerophytum, Monilaria, Oophytum. – In: Hartmann, H. E. K., Illustrated handbook of succulent plants. Aizoaceae, ed. 2. – Berlin: Springer. p 691