|Adromischus hallii (engl)|
|Adromischus - species|
|Écrit par P.C. Hutchison|
|Dimanche, 14 Décembre 2008 17:47|
ICONES PLANTARUM SUCCULENTARUM
1. Adromischus hallii P. C. Hutchison*.
*University of California Botanical Garden Contribution Number 137.
By P. C. HUTCHISON
Cactus and Succulent Journal US XXVIII Nr. 5 1956
FIG. 111. Adromischus hallii P.C. Hutchison, the clonotype, U.C.B.G. n° 53.1115-2.
FIG. 112. Adromischus hallii P. C. Hutchison. 1. Leaf, side view, la. Leaf, apical view. 2. Leaf, top view and cross-sections. 3. Flower. 4. Perianth limb, expanded. 5. Perianth limb, recurved. 6. Bud. 7. Cross-section perianth tube at midpoint. 8. Stamen insertion. 9. Carpels. 10. Nectary scale. 11. Anther. 12. Anther apex. 1-2 natural size. 3-9, x 3. 10-11, x 9. Dots on 4, 5 and 8 indicate papillae: on 11-12, red spots. Drawing by Mrs. M. Blos.
Adromischus hallii P. C. Hutchison, sp. nov.
Planta nana; caules 1-2 cm. longi; folia arcte rosulata sessilia asymmetrice rotunda usque ad 2.5 (3.5) cm. longa lataque et usque ad 13 mm, crassa alba, margine apicali bullato incrassato concolori vel obscure fusco-rubro, omnibus sectionibus transversalibus saepe asymmetricis; flores 10-15 erecti solitarii; pedicelli usque ad 10 mm. longi; perianthii tubus glauco-viridis 14 mm. longus, superficie interiore laete viridi quadrante superiore papillosa, lobi patentes vel recurvati 2 mm. lati 3 mm. longi albidi et roseo-tincti marginibus fusco-rubri basi papillosi.
FIG. 113. Adromischus hallii Hutchis., U.C.B.G. No. 53.1115-1.
FIG. 114. Adromischus hallii Hutchis., U.C.B.G. No. 53.1115-3.
South Africa: Namaqualand, at the base of the Buchu Twins ca. 10 miles south of Alexander Bay, originally collected by H. Hall, University of California Botanical Garden number 53.1115-2 (BOL-Holotype).
Three plants of this new species were received from Mr. Hall and survive in cultivation here. Clone -2 was chosen as the clonotype and from it the drawing and the holotype were prepared. There is no significant vegetative variation between the three clones.
Adromischus hallii belongs with a group of Namaqualand species that includes A. herrei (Barker) Poellnitz, A. marianae (Marloth) Berger, A. kubusensis Uitewaal, A. antidorcatus Poellnitz and A. rodinii Hutchison. It differs from all these species by its sessile asymmetricaI white leaves. This group of species appears to be sufficiently natural to be considered a section. However there are some additional taxa to be described which belong here and until they are studied further the sectional diagnosis will be delayed.
The specific name honors the collector, Mr. Harry Hall of the National Botanic Garden, Kirstenbosch, Newlands, C. P., Union of South Africa, whose many collections of African succulents, particularly from the Cape and from Namaqualand, are especially noteworthy for the number of rare and new species and his fine habitat notes. Mr. Hall responded to my request for a brief biographical statement with the following: "I underwent the usual horticultural training: Reading, John Innes Horticultural Institute, Kew, and a year at La Mortola. I have been interested in succulents since 1932 and from 1933 to 1947 was in charge of the Darrah collection of cacti and succulents in Manchester, England, apart from the war years when I was in the R. A. F. Since coming here Kirstenbosch in 1947 I have devoted all my spare time, apart from various "official" expeditions, to plant collecting, largely succulents."
Mr. Hall has published a number of descriptive accounts of his travels in South Africa in the British cactus journals and recently he wrote an excellent small handbook on some African succulents ("Common Succulents" by H. Hall, Longmans, Green & Co., Cape Town, 1953, xv + 32 pp., 4 color plates showing 16 species). Several years ago a Euphorbia which he collected was named in his honor (Eurphorbia hallii R. A. Dyer, Journ. So. Afr. Bot. 19 (4): 135-136, pl. 19, 1953).