CRAIB—DIDISSANDRA AND ALLIED GENERA. 257 
was introduced a few years ago by Mr. R. G. Farrer, but unfortu- 
nately under a wrong name, viz. Oreocharis Henryana. The 
latter plant is a true Oveocharis, i.e. the four anthers are free and 
not coherent in pairs, whereas Farrer’s plant has the four anthers 
cohering in pairs. Farrer collected his plant in S. Kansu. 
The remaining four species have been introduced into this 
country through Mr. George Forrest, who collected seeds of them 
in Yunnan. The genus Didissandra is represented by one 
species—D. sericea, and the genus Briggsia by three species— 
B. Agnesiae, B. longifolia, and B. muscicola. Of these the last 
two have not yet flowered here. Didissandra sericea and Briggsia 
Agnesiae both flowered here this year. The latter is, I think, 
one of the most charming of the plants of recent introduction. 
KEY TO THE GENERA. 
Anther cells divergent, dehiscing lines confluent, at right angles to 
filament ; corolla small to medium-sized, with stoutish unicellular 
hairs arranged in two more or less well-defined rows alternate with 
the lobes of the anticous lip and extending well down the tube, 
glabrous posticously ; anthers finally withdrawn well down the 
corolla tube by the filaments coiling spirally ; inner surface of 
placental lamellae conspicuously hai : .  Didissandra. 
Anther cells and their lines of dehiscence more or less parallel to the 
lament ; corolla large to- medium-sized ; hairs inside corolla not 
arranged in rows ; filaments not spirally retracted ; inner face of 
placental lamellae glabrous or with very few inconspicuous hairs. 
Anthers brought into contact by the gradual inarching of the fila- 
ments: corolla tube markedly inflated anticously ; posticous 
lip distinctly lobed . : i : : : . Briggsia. 
Anthers brought into contact by a right-angle bend at apex of fila- 
ments ; posticous li lobed, emarginate or subentire. 
Corolla limb distinctly bilabiate, not patent, tube usually slightly 
inflated about the middle or slightly above the middle . ; 
: i ‘ ; ; ‘ ,. ; pha lostemon. 
Corolla limb of 5 subequal lobes, only very slightly bilabiate, 
spreading, tube not inflated . ; : - Isometrum, 
' ENUMERATION OF SPECIES. 
Didissandra, C. B. Clarke. 
Outer leaves 6-8.5 cm. long, lanceolate to ovate-lanceolate, soon quite 
glabrous above, nerves 4-6 pair, more or less impressed on the 
upper surface 
Lower surface of leaf ultimately lanate only on midrib and nerves ; 
inflorescence soon glabrous : : : . I. patens. 
Lower surface of leaf persistently cinnamomeous or ultimately silvery 
lanate : indumentum on peduncle, pedicels and outside of calyx 
persistent. oe 
Corolla up to 13 mm. long . : ‘ : . 2, Kingiana. 
Corolla 18 mm. long. ‘ S855 : ‘ . 3. grandis. 
