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MR. R. ALLEN ROLFE ON THE GENUS VANILLA. 449 
Hairs on disc of lip numerous and 
spreading. 
Lip 3-lobed, with broad side lobes 42. V. Parishii. 
Lip obscurely 3-lobed —.... wu. 43. V. calopogon. 
6. Hairs on disc of lip under | lin. long 44, V. Wightiana. 
** Sepals and petals 2-33 in. long .... 
a. Lip glabrous, with two pubescent lines 
from base to middle. 
i. Ceylon species weve wens we 45. V. Walkeria. 
il. African species. 
Continental African species we 46. V. Roscheri. 
Mascarene species. 
Hairy lines of disc nearly obsolete. 
(Madagascar) . 47. V.madagascariensis. 
Disc with two broad pubescent 
lines below middle. (Seychelles) 48. V. Phaclnopsis. 
b. Lip velvety, disc villose towards the 
centre seve seve seve wee 49. Vi Humblotii. 
Section doubtful. Lip margined and veined 
with dark violet. Santo Domingo species 50. V. Pottai. 
DESCRIPTION OF SPECIES. 
Sect. I. Foriosa.—Caules foliati, foliis alternis variis. 
Sp. 1-37. 
1. Vantnna tnopora, Schiede, in Linnea, iv. (1829) p. 574, et 
vi. (1831) p. 59; caule crassiusculo, paullo flexuoso; foliis 
subsessilibus ovato-ellipticis vel elliptico-oblongis breviter 
acuminatis; racemis axillaribus vel subterminalibus flexuosis ; 
bracteis ovato-oblongis vel lanceolato-ovatis subacutis rarius 
foliaceis; sepalis petalisque lanceolato-oblongis subobtusis ; 
labello trilobo sepalis petalisque fere squilongo latissimo basi 
columnex adnato, lobis lateralibus oblongis obtusis, lobo inter- 
medio late ovato-oblongo subacuto; disco tricarinato, columna 
clavaté; capsulis lineari-elongatis gracilibus inodoris.—Lindl., 
Gen. and Sp. Orch., p. 437; Klotzsch, in Bot. Zeit., iv. (1846) 
p. 564; Hemsl., Biol. Centr. Amer., iii. p. 294. 
Kpidendrum Vanilla, L. Sp. Pl., ed. I. p. 952 (partim). 
Vanilla mexicana, Mill., Gard. Dict., ed. 8 (1768), n. 1 
(partim). V. aromatica, Sw. in Nov. Act. Soc. Sci. Upsal., vi. 
(1799) p. 66, et in Schrad. Journ., ii. p. 208 (partim) ; Lindl., 
Gen. and Sp. Orch., p. 434 (partim) ; Cogn. in Mart. Fl. Bras., 
LINN. JOURN.—BOTANY, VOL. XXXII. 26 
