216 FLORA NIGRITIANA. 
The limited accommodation under which Dr. Vogel suffered, 
probably prevented him from preserving the species of this 
genus, which appears to abound in Western Tropical Africa. 
Three other species inhabit Senegambia, N. rufescens, micrantha 
and abbreviata (all of Guill and Perr.); whilst a fourth 
abounds along the coast, N. dentata, Schum. and Thonn. (N. Lo- 
tus, Pal. de Beauv.); and two additional ones, N. maculata 
and N. Guineensis, Schum. and Thonn., have been described 
from Guinea. 
VI. PaPAVERACEX. 
The widely diffused Argemone Mezicana is included by 
Guillemin and Perrottet in the Flora of Senegambia. 
VII. CRUCIFERÆ. 
An Order as impatient of hot, low and humid climates as are 
the Ranunculacee. One species of Nasturtium is enumerated 
by De Candolle as a West African plant. — Crucifere in general 
appear to be in a great measure represented by the following order. 
VIII. CarPARIDEX. 
I. Ritchiea erecta, Hook. fil.; (Tas. XIX et XX.) fruticosa, 
erecta, ramosa, ramis verrucosis, foliis patulis longe petiolatis 
8-foliolatis, foliolis oblongo-lanceolatis breviter acuminatis bast 
angustatis integerrimis, racemo terminali multifloro, sepalis 
lanceolatis acuminatis, petalis lineari-ligulatis, staminibus 
numerosis calyce longioribus, antheris parvis.— Fernando 
Po, Vogel. 
Frutex glaberrimus. — Petioli teretes, 3-4-unciales, stricti. Fo- 
liola petiolo zquilonga vel longiora, nunc 6-8 unc. longa, 
breviter petiolata. Racemus terminalis, 2-3-uncialis, cicatri- 
cosus ; pedicellis 4 unc. longis, erectis, basi utrinque bracteo- 
latis. Sepala }-pollicaria, acuminata, marginibus puberulis. 
Petala anguste linearia filamentaque albida. Anthere parv®, 
nigrescentes, 
A very handsome species, and quite distinct from the following 
in the erect, branching and not climbing habit, the much longer 
petioles, smaller flowers and differently shaped leaflets and 
petals. 
