289 



TWO NEW GENERA OF COMPOSITE. 

 By W. p. Hiern, M.A., F.L.S. 



(Plates 388 a, 389.) 



The plants here dealt with form part of Welwitsch's African 

 collection ; they were obtained in Benguella in 1859-60. The 

 determinations are taken from the forthcoming part of the Wel- 

 witsch Catalogue, which to this extent is thus anticipated, so as to 

 secure early publication and to take advantage of the accompani- 

 ments of the plates here afforded. 



The material at hand for the former of the two genera is some- 

 what fragmentary, and very small in bulk ; indeed, though the 

 plant does not exceed 4 in. in length, the specimens do not give any 

 adequate idea of the plant as a whole ; fortunately, Welwitsch's 

 notes enable some account to be given of the plant as it appeared 

 to him, including the colour of the florets, and complete heads of 

 flowers were preserved for examination ; thus all the characters 

 essential for the establishment of the genus have been ascertained. 



The material for the other genus is ample, and the difficulty with 

 it is to assign it to its tribe in the order ; on this point Welwitsch 

 noted as follows : — Habit of Cineraria, but the style and opposite 

 leaves keep it out from this genus and from Senecio ; the elongated 

 style-branches and the opposite leaves, also the large long flower- 

 rays, somewhat correspond with Arnica, a genus, however, which 

 belongs to the northern hemisphere, though A. tahularis Thunb. 

 [Alciope tahularis DC.) more or less agrees, except for the alternate 

 leaves and the absence of the rows of the remarkable oil-glands from 

 the achenes of the latter ; the style-branches are nearly those of the 

 tribes Vernoniacece or EupatoriacecB, and in this respect it may be 

 remembered that DeCandolle and Endlicher placed Alciope in Eu- 

 jMtoriacecB, that Lessing placed it in Seneciojiidece, and Harvey in 

 AsteroidecB; Adenogonum fluctuates between Asteroidea and Seneci- 

 onidecB. 



Psednotrichia, gen. nov. 

 Capitula homogama, discoidea, multiflora ; floribus omnibus 

 hermaphroditis, fertilibus, tubulosis. Involucrum cum alabastris 

 subglobosum, cum floribus vel fructibus campanulato-hemisph^ri- 

 cum ; bracteis subuniserialibus, sub^qualibus, siccis, margine an- 

 guste membranaceis ; receptaculo nudo, hemisphterico, demum 

 foveolato-areolato. Corolla regularis, semi- vel brevi-quinquefida. 

 Antherse inclusEe vel vix cum corollse lobis sequatae, apice in appendi- 

 cibus lanceolatis brevibus productse, basi obtusaB ecaudatse integrge. 

 Styli rami breves, recti vel leviter curvi, compressiusculi, non 

 attenuati, obtusissimi, cum appendiculo deltoideo-lanceolato vel 

 lanceolato-subulato deciduo mucronulati, in corollas tubo plus minus 

 inclusi, longiores vel cum androecio ^quati. Ach^nium oblongum 

 vel obovoideo-oblongum, parum compressiusculum, costis vel 

 angulis 5 longitudinalibus atque glandulorum breviorum pallidorum 

 plus minus deciduorum in intervallis positis seriebus. Pappus 



Journal of Botany. — Vol. 36. [Aug. 1898.] x 



