ACANTHACEAE

SIPHONOGLOSSA AND  AULOJUSTICIA IN SOUTHERN AFRIC

FSA contributions 15

Piperacea

FSA contributions 6: Orchidaceae: Holothrix

No abstract availabl

Studies in the southern African species of Justicia and Siphonoglossa (Acanthaceae): seeds

The seeds of all species of Justicia (except J. thymifolia (Nees) C.B. Cl.) and Siphonoglossa in the southern African region (as defined by the Flora of southern Africa) were examined with the Scanning Electron Microscope. A wide range of different seed surfaces were seen, many of which could be correlated with other characters to further reinforce grouping of species into sections. However, some species that on other characters, would be placed together, had widely differing seed testas. Gross surface morphology varied from smooth to colliculate, irregularly rugose, reticulate with the ridges variously arranged, wheel-shaped (radiate or ammonite-like), with a central ridge or with multicellular barbed scales. The seeds were without hairs, unlike some American species sometimes considered to belong in Justicia (Graham 1989). Micromorphology also provided useful characters, with seeds being reticulate, papillate, minutely or deeply rugose or with one to many crystals visible. Critical-point drying was sometimes helpful in viewing microstructure

Studies in the <i>Justicia</i> and <i>Siphonoglossa</i> (Acanthaceae) species of southern Africa: final conclusions

On the basis of seed surface micromorphology, pollen and inflorescence type, as well as characters of the capsule, seven sections can be distinguished in the southern African species of Justicia. The relationship of these to the sections recognised by Graham is discussed. A key to the sections and a synopsis of their main distinguishing characters are presented. One new section, sect. Minima lmmelman, is described. A short note on the generic position of the Siphonoglossa species of the region, following on from a previous paper, is also given

Synopsis of the genera <i>Nesaea</i> and <i>Ammannia</i> (Lythraceae) in southern Africa

The genera  Nesaea Commers. ex H.B.K. and  Ammannia L. in southern Africa, which comprises Namibia, Botswana, South Africa, Swaziland and Lesotho, were revised. In  Nesaea, 27 species (seven new), four varieties and one new form were recognized.  Ammannia was revised using the DECORANA computer program, and four species were recognized. Keys to the taxa are presented, as well as synonymy (restricted to the region), diagnoses and descriptions o f new taxa, and notes on distribution, taxonomy and nomenclature. The following taxa are new:  Nesaea alata Immelman,  N. angustifolia Immelman.  N. cymosa Immelman,  N. minima Immelman.  N. sagittifolia (Sond.) Koehne var.  ericiformis Koehne forma swaziensis Immelman.  N. saluta Immelman, N. wardii Immelman and  N. zambatidis Immelman

Synopsis of the genus <i>Salix</i> (Salicaceae) in southern Africa

One species of  Salix, S. mucronata Thunb. (=S .  subserrata Willd.), with five subspecies, is recognized as indigenous to the southern African region. Problems of delimitation in the genus in southern Africa are discussed, and a key to the indigenous and exotic taxa is presented. The synonymy of the subspecies is presented, with leaf silhouettes and a distribution map of each. The following new combinations are made: S. mucronata subsp. hirsuta (Thunb.) Immelman, S.  mucronata subsp. capensis (Thunb.) Immelman, 5.  mucronata subsp. woodii (Seemen) Immelman and  S. mucronata subsp. wilmsii (Seemen) Immelman

SIMAROUBACEAE

FLOWERING IN  KIRKIA WILMSII ENGL