Drosanthemopsis

Primary tabs

Drosanthemopsis

Drosanthemopsis Rauschert in Taxon 31: 555. 1982 sec. Klak & al. 20181
  • 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. – S. African J. Bot. 116: 67-81, 2. Hartmann, H. E. K. 2017: Jacobsenia - Ruschioideae. – In: Hartmann, H. E. K., Illustrated handbook of succulent plants. Aizoaceae, ed. 2. – Berlin: Springer, 3. 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. – S. African J. Bot. 116: 67-81
  • 4. 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, 5. Kew WCVP (2019), 6. 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. – S. African J. Bot. 116: 67-81
  • 7. 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. – S. African J. Bot. 116: 67-81, 8. Hartmann, H. E. K. 2017: Knersia - Ruschioideae. – In: Hartmann, H. E. K., Illustrated handbook of succulent plants. Aizoaceae, ed. 2. – Berlin: Springer, 9. 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. – S. African J. Bot. 116: 67-81

Notes

Drosanthemopsis shares many characteristics with Jacobsenia, which prompted Ihlenfeldt (1997) to include D. vaginata in Jacobsenia. Differences between the two genera are given (...). Certain epidermal characters in Drosanthemopsis are unique within the Aizoaceae.A

Description

Succulent perennial caespitose shrublet, main stems erect to 150 (−200) mm high or procumbent to 80 mm high, stems to 10 mm diam.; difference between long and short shoots distinct or indistinct. Leaves succulent, opposite, basally free or fused into a sheath, dirty green to reddish, rarely grey, ascending, trigonous to club-shaped, upper surface flattened, lower surface towards the apex distinctly keeled or keels indistinct to apically rounded, to 8–35 mm long and 4–11 mm diam., at least the last leaf-pair of the season persisting on the stem until the next season; leaf-pairs of a season isophyllous, basally free or connate for c. 1/5 of their length; epidermis with large bladder cells with thickened outer walls, cells 0.075 mm to 0.3 mm diam., ± circular to polygonal, bladder cells with flat top either covered with tiny protrusions on their surface or with many antler-like protrusions, especially along the margin. Flowers terminal, solitary, emerging from the connate portion of the 1st leaf-pair of the season, 32–40 mm diam., pedicels 6–23 mm long, sepals 6 (to 8), succulent, the two outer calyx lobes opposite and bigger than the inner four lobes, petaloid staminodes in 4 or 5 rows, pink or white or pink with white centre, inner petals shorter, filamentous staminodes very few or absent, filaments white or yellow, papillate at bases; nectary a crenulate ring; flowering July to September. Fruit a hygrochastic capsule, borderline between expanding keels and expanding sheets distinct; covering membranes covering more than ¾ of the locule, without additional closing devices below the covering membranes, closing bodies absent, present or infrequently formed, numerous sterile funicles in the upper part of the placenta, valve wings broad; locules 6–9(−16), 5–17 mm diam. Seeds with translucent testa or testa ochre to brown, testa minutely papillate, c. 0.7 × 0.5 mm.A

Bibliography

A. 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. – S. African J. Bot. 116: 67-81