Britton: Studies of West Indian plants XII 7 



pairs of veins, the first pair from near the base, the second pair 

 from a short distance above, the third pair from below the 

 middle, the transverse venation widely spreading. Inflorescence 

 of sessile panicles borne on the branches much below the leaves, 

 the panicle-branches filiform; flowers 2 or 3 together, sessile, 

 subtended by subfoliaceous bract lets; calyx subcampanulate 

 with 4 subulate teeth. 



Necramium gigantophyllum Britton, sp. nov. 



Stems slender, simple or few-branched, quadrangular, 2 m. 

 high or higher, densely scurfy-puberulent above. Leaves oblong 

 to oblong-oblanceolate, 2-4 dm. long, 12 cm. wide or less, entire, 

 green on both sides, but paler beneath than above, glabrous 

 above, scurfy-puberulent on the veins beneath, the apex acu- 

 minate, the base narrowed, the stout scurfy petioles 1-2 cm. 

 long; panicles densely pubescent, several-flowered, about 4 cm. 

 long; bractlets oblong-lanceolate, concave, acute, pubescent, 3 

 mm. long; calyx-tube 2 mm. long, its teeth 1 mm. long; petals 

 and stamens unknown. 



Forests at high altitudes, northern mountain range; type 

 from Heights of Aripo {Trinidad Herbarium 9798, collected by 

 Broadway, January 10-26, 1922); Mount Tocuche {Britton, 

 Hazen & Mendehon 1334), April 3-5, 1920. 



72. THE GENUS DORSTEXIA IX THE WEST INDIES 



Leaves large, deeply lobed or undulate; receptacle quad- 

 rate. 1. D. Contrajerva. 

 Leaves small, dentate, crenate or entire; receptacle 

 suborbicular, discoid or cyathiform. 

 Leaves not peltate. 



Leaves orbicular, deeply cordate. 



Leaves crenate; receptacle cyathiform. 2. D. crenulata. 



Leaves entire or obsoletely repand. 



Receptacle pubescent, discoid. 3. D. tuberosa. 



Receptacle puberulent, about as long as broad 4. D. Rocana. 



Leaves ovate to oblong or elliptic. 



Leaves ovate, deeply cordate. 5. />. cordifolia. 



Leaves oblong to elliptic, cordate or subcordate, 

 crenulate. 6. D. tubicina. 



Leaves peltate. 



Leaves ovate-oblong, peltate very near the base 7. D. petraea. 



Leaves ovate to orbicular, peltate at the middle 



or somen hat below. 

 Leaves orbicular, pubesi ent on both si' 8. D. peltata. 



I eaves suborbicular to i vate, more or less longer 

 than broad. 



