Tas. 7090. 
CABOMBA aauvatica. 
Native of Tropical America. 
Nat. Ord. NympH*#acex.—Tribe CanomMBEZ. 
Genus Canomna, Aublet ; (Benth. et Hook. f. Gen. Pl. vol. i. p. 46.) 
eae bar erin ; folis ellipticis, floribus flavis, petiolis pedicellisque pu- 
erulis. 
C. aquatica, Aub. Pl. Guian. vol. i. p. 321, t. 121; Lamk. Dict. vol. i. p. 526; 
Lil. Gen. t. 261; DC. Syst.Veg. vol. ii. p.36; Prodr. vol. i. p. 112 ; BR ichard 
Anal. des Fr. pp. 63, 64, t. 1, £.83; 4. Gray Ann. Lyc. New York, vol. iv. 
p- 46; Caspary in Mart, Fl. Bras. fasc. lxxvii. p. 138, t. 37, £. 1-24, 
Nectris aquatica, Willd. Sp. Pl. vol. ii. 248 ; Pers. Synops. p. 394. 
A very interesting water-plant, belonging to a tribe of 
the Natural Order Nymphewacew, which tribe consists of but 
two genera, the present with two (or perhaps more) species, 
and Brasenia with but one. Of the two genera the latter | 
is the most interesting, from the fact of the singular dis- 
tribution of its solitary species, B. peltata. This, after 
being known for many years as confined to North America 
and Eastern Australia, was found by Griffith in a single 
spot in the East Bengal (where also it was gathered, in 1850, 
by Dr. Thomson and myself), and it has since been found to 
exist very locally in Japan and Western Africa. In having 
this wide distribution it resembles many water-plants, 
but in being local wherever found, it differs from almost 
all. , 
Of the species of Cabomba, four only are well defined. 
One, that here figured, is spread over the still waters of the 
South American continent from Mexico to South Brazil. 
Its exact northern limit is not known, but in the southern 
United States it is replaced by C. caroliniana, A. Gray, 
which differs in the very much narrower leaves, white 
flowers, and short anthers. The two others are C. piau- 
hiensis, Gardn., and C. Warmingii, Caspary, both natives _ 
of Brazil. . es 
The specimen of C. aquatica here figured was raised 
from seeds sent from Demarara to the Royal Gardens by 
DEcEMBER Ist, 1889, 
