Jacobsenia hallii L.Bolus
publication ID |
https://doi.org/ 10.1016/j.sajb.2018.02.402 |
DOI |
https://doi.org/10.5281/zenodo.14047179 |
persistent identifier |
https://treatment.plazi.org/id/0389444F-FF90-6622-D332-DBFE9F994B4B |
treatment provided by |
Felipe |
scientific name |
Jacobsenia hallii L.Bolus |
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2. Jacobsenia hallii L.Bolus View in CoL ,
Notes Mesembryanthemum 3: 329 (1958). Drosanthemum jacobsenii G.D. Rowley, Natl. Cact. Succ. J. 33(1): 8 (1978).
Type: South Africa. Western Cape, Komkans (3118AA), 50 miles N of Vredendal , 3rd Sept. 1955, H. Hall sub NBG 405/54 ( BOL, holo!) .
Compact shrublets to 15 cm high, main stem in old plants procumbent, adult plants without clear distinction between long shoots and short shoots; each stem mostly developing 2 leaf-pairs per season; leaf-pairs occasionally slightly anisophyllous. Leaves often slightly curved, moderately spreading, mostly terete with upper surface flattened, lower surface slightly keeled, 30–70 mm long, 8–10 mm diam.; epidermis with large, ± circular bladder cells with a single central hair-like protrusion. Flowers emerging from the connate portion of the 2nd leaf-pair of the season, 80–85 mm diam., pedicels 10–20 mm long; sepals 6, two outer ones opposite, the remaining spirally arranged; petals white or light yellow; filaments deep yellow. Fruit shape of capsule seen from above 6-angled, 8–17 mm diam., locules mostly 6, rarely 5, 7 or 8.
Ecology and distribution: The species is restricted to a small area north of Vredendal, South Africa.Here it forms very localized, dense colonies on loamy strongly saline sand, with a cover of large quartz gravel. Flowering time is from August to September. ( Fig. 7 View Fig ).
Diagnostic characters: Jacobsenia hallii has a compact habit, lacking the characteristic long shoots found in J. kolbei . The epidermis of the leaves is covered with large bladder-cells, which each have a single central hair-like protrusion.
Conservation status: Jacobsenia hallii is a rare species, known from only two localities and has been listed by Raimondo (2009) as vulnerable (VU).
Additional specimens examined
South Africa. WESTERN CAPE: 3117 (Lepelfontein): NE of Brand se Baai , farm Kerskloof (-BB), Klak 2318 (BOL) ; 3118 (Vanrhynsdorp): NW of Komkans (−AA), Bruyns 6142 (BOL) ; Komkans (− AA), H. Hall sub NBG 405 /54 (BOL) ; NW of Komkans farm house (− AA), Klak 2293 (BOL) ; Komkans , H. Hall 2569 (NBG) .
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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