RARE PLANTS FROM MADAGASCAR. 331 
A. CITRATUM, Thouars. Very common in the forest, Ankafana, 
Imarina.— Deans Cowan. 
AERANTHUS MACROSTACHYS, Rchb. f. I have little doubt as to 
the correctness of referring to this species a drawing accompany- 
ing specimens collected by Deans Cowan on trees at Ankafana, 
although it differs from the figure of Epidendrum macrostachys, 
Thouars, Orch. Isles d'Afrique, fig. 83, on which this species was 
based, in having no cusp in the cleft of the labellum ; the base 
of the labellum has a eonspicuous green blotch ; and the tip of the 
spur is also green. 
BrcogNELLA GRACILIS, Lindl, marina; in marshes at Anka- 
fana. Deans Cowan. The flowers are represented as rose-pink in 
colour. 
SATYRIUM TRINERVE, Lindl. Grassy plains, Ankafana.— 
Deans Cowan. Flowers white. 
S. GRACILE, Lindl. Imarina.-—Deans Cowan. Flowers white. 
Disa BUCHENAVIANA, Kranzl. ex descr. Imarina.—Deans 
Cowan. 
HABENARIA PURPUREA, Thouars. Bara, Imarina, lvatolo in 
the valley to the north, April 9, 1880.—Deans Cowan. Imarina, 
“Am Rande eines Baches, Juli 1880."— Hildebrandt, no. 3495. 
I have every reason to believe in the correctness of this iden- 
tification, although Thouars’s figure gives no details of struc- 
ture; and I have seen no authentic specimen. The colour of 
Thouars's figure is pink; but Deans Cowan's drawing gives it of 
a purple colour, very much like that of Orchis mascula. 
Crnosorcuis UNIFLORA, Lindl. Near water in open country, 
Ankafana.— Deans Cowan. The single specimen collected by 
Lyall, on which Lindley founded the description of this species, 
has but one flower, as its name denotes; but in all the other 
specimens which I have seen there have been more, from 2 to 4. 
The flowers are the largest in the genus, except those of C. gran- 
diflora. The sepals and petals are dark green, the labellum dull 
pinkish red with a purple blotch at the base. 
C. arpzosa, n. sp. Herba terrestris sesquipedalis, tuberibus 
lanatis, foliis radicalibus 1-2 ovatis lanceolatis, scapo erecto 
hispido, foliis caulinis duobus distantibus lanceolatis acuminatis ; 
2D2 
