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 14459). 



Nearest to Caconapea decumbens (Fernald) Pennell, comb, 

 nov. [Herpestis decumbens Fernald Proc. Am. Acad. 33: 91. 

 1897] f 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 Naias, a water-nymph, and pif, 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, 191 1 (/. A. 

 Shafcr 10829). 



Submerged in lagoons, Pinar de Rio and Isle of Pines. 

 Endemic. 



