Drosanthemopsis vaginata

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Drosanthemopsis vaginata

Drosanthemopsis vaginata (L.Bolus) Rauschert in Taxon 31: 555. 1982 sec. Klak & al. 20181
  • Drosanthemum vaginatum L.Bolus, Notes Mesembryanthemum 2: 138. 1929 syn. sec. Klak & al. 20181
  • Anisocalyx vaginatus (L.Bolus) L.Bolus in J. S. African Bot. 28: 303. 1962, nom. illeg., syn. sec. Klak & al. 20181,2
  • Jacobsenia vaginata (L.Bolus) Ihlenf. in Mitt. Inst. Allg. Bot. Hamburg 27: 124. 1997 syn. sec. Klak & al. 20181
    • Type: "South Africa. Little Namaqualand, on the road between Vanrhynsdorp and Bitterfontein, without date, L. Bolus sub NBG1759/29 (BOL, holo.!). [Note: The locality of the type collection is thought to be an error, since this species has never been recorded so far to the south (Ihlenfeldt, 1997).]"3,4
  • 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. 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, 3. Ihlenfeldt, H.-D. 1997: The systematic position of the genus Drosanthemopsis Rauschert and a revision of the genus Jacobsenia L.Bolus et Schwantes (Mesembryanthemaceae). – Mitt. Inst. Allg. Bot. Hamburg 27: 109-126, 4. 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
  • =Anisocalyx salarius L.Bolus, Notes Mesembryanthemum 3. 1958 syn. sec. Klak & al. 20185
  • Drosanthemopsis salaria (L.Bolus) Rauschert in Taxon 31. 1982 syn. sec. Klak & al. 20185
    • Type: "South Africa. Northern Cape, Riethuis (3017AB), 29 Nov. 1957, H. Hall sub NBG634/57 (BOL, holo.!; NBG, iso.!)."6
  • 5. 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, 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

Notes

Drosanthemopsis vaginata can be distinguished from all other species in the tribe with a similar habit by its remarkable and unique bladder cells. A very similar epidermis is only found in D. kwaganapensis, from which it differs by its grey leaves and its low spreading habit.A

Conservation

Drosanthemopsis vaginata is a rare species, known from only a few localities and is listed by Raimondo (2009) as vulnerable (VU).A,B

Description

Compact shrubs to 8 cm high, main stem in old plants procumbent, young internodes indistinctly papillate becoming smooth with age, difference between long shoots and short shoots indistinct; each stem mostly developing 2 leaf-pairs per season. Leaves basally fused into a sheath, sheath to 10 mm long, grey, usually ascending, upper surface flattened, lower surface towards the apex slightly keeled, 23–35 mm long, 8–11 mm diam.; epidermis with large, ± circular bladder cells with flat top, with many antler like protrusions, especially along the margins. Flowers emerging from the connate portion of the 1st or 2nd leaf-pair of the season, 35–40 mm diam., pedicels 7–10 mm long; sepals mostly 6, rarely up to 8, the two outer ones opposite, the remaining spirally arranged; petals white; filaments white. Fruit shape of capsule seen from above ± circular to elliptic, 5–9 mm diam., locules 6–13. Seeds brown to light brown, testa minutely papillate, c. 0.7 × 0.5 mm.A

Citation

Jacobsenia vaginata (L.Bolus) Ihlenf.: 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: 691 (as Jacobsenia vaginata (L.Bolus) Ihlenf.)

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
B. Raimondo, C. et al. 2009: Red List of South African plants 2009