BRITTON: CUBAN PLANTS NEw To SCIENCE 105 
Type, river woods, vicinity of San Pedro, Isle of Pines, col- 
lected in flower and fruit, February 15-17, 1916 (Britton, Wilson 
& Selby 14450). 
Nearest to Caconapea decumbens (Fernald) Pennell, comb. 
nov. . [Herpestis decumbens Fernald Proc. Am. Acad. 33: 91. 
1897] of Mexico, which, however, has sepals reaching 8-9 mm. 
long, obscurely reticulate (not rugose), corolla 8 mm. long, 
anther-sacs over twice as large (0.8 mm. long), and seeds nearlv 
as wide as long and with prominent cross-reticulations. 
NAIADOTHRIX Pennell, gen. nov. 
Stems submersed, long, much branched, glabrous or puberu- 
lent, terete. Leaves opposite, divided so as to appear whorled, 
and with ultimate filiform segments. Pedicels longer than the 
calyx, not bracteolate. Sepals five, alike or slightly unequal. 
Corolla blue, campanulate-personate, pubescent within on anterior 
side, the lobes about equaling the tube, the two posterior lobes 
united over one half length. Filaments four, glabrous, the poste- 
rior pair shorter. Anthers glabrous. A circle of bristles sur- 
` rounding the base of the ovary. Style glabrous. Stigmas dis- 
tinct. Capsule oblong, thin-walled, glabrous, septicidal and 
tardily loculicidal. Coalesced placentae and septum rather thick, 
little over one-half length of capsule. Seeds oblong, reticulate. 
[Name from Naus, a water-nymph, and @pé, hair, in allusion 
to the finely divided leaves.] 
Type species: Naiadothrix longipes Pennell. 
Leaves, bristles surrounding ovary, and aquatic habit sharply 
distinguish Naiadothrix from all other segregates of Herpestis. 
Naiadothrix longipes Pennell, sp. nov. 
Stems, pedicels and calyx obscurely glandular-granulose. 
Leaves 2-2.5 cm. long, three-branched from base, each branch 
and its pinnate segments filiform. Pedicels 35-50 mm. long. 
Sepals nearly uniform, lanceolate-linear, 3 mm. long. Corolla 
6-7 mm. long, glabrous within, at least the posterior lobes blue 
(the anterior probably yellowish). Capsule 2 mm. long. Seeds 
0.7-0.8 mm. long, brown. 
Type submerged in water, Laguna Jovero and vicinity, Pinar 
del Rio, collected in flower and fruit, December 5-7, 1911 (J. A. 
Shafer 10829). 
Submerged in lagoons, Pinar de Rio and Isle of Pines. 
Endemic. 
