94 BrITTON : CUBAN PLANTS NEw To SCIENCE 
mm. long, obtuse or acutish, glabrous; corolla pinkish-white, 12-13 
mm. broad; filaments pubescent near the base; capsule immature. 
White sandy places, vicinity of Los Indios, Isle of Pines 
(Britton & Wilson 14205). 
Family APOCYNACEAE 
Rauwolfia linearifolia Britton & Wilson, sp. nov. 
A glabrous shrub 4.5 dm. high, with slender grayish branches. 
Leaves in whorls of 3’s, linear, 4-6.5 cm. long, 3-4 mm. wide, 
dark green above, paler beneath, the midvein prominent on both 
surfaces, the lateral veins indistinct ; calyx-lobes lanceolate, 1-1.5 
mm. long, acute to acuminate; corolla purplish, its tube slender, 
7-9 mm. long, the lobes elliptic, 4 mm. long, 1.3 mm. wide; ovary 
immersed in a cup-shaped disk ; style filiform; carpels two, united 
at the base, one carpel sometimes abortive. 
Type collected on limestone hill, Paso Estancia to the Pinales, 
Oriente (Shafer 1754). 
Echites minima Britton & Wilson, sp. nov. 
Stems slender, twining, puberulent. Leaves oblong, 1-2 cm. 
long, 4-5 mm. broad, acuminate at the apex, rounded and cordate 
at the base, glabrous, short-petioled, the midvein indistinct above, 
prominent beneath ; calyx-lobes elliptic-lanceolate to elliptic, 2-2.5 
mm. long, I-I.1 mm. broad, acuminate at the apex; corolla-tube 
3-3-5 mm. long, the lobes suborbicular, light yellow, 3.5 mm. 
long, 4 mm. broad. 
In dry grassy places, barren savannas southeast of Holguin, 
Oriente (Shafer 2955). 
An incomplete specimen from savannas between Queen City 
and Minas, Camaguey (Shafer 2928), is referred to this species 
with doubt. 
Family CONVOLVULACEAE 
Exogonium incertum Britton, sp. nov. 
Vine, slender, glabrous up to 8 dm. long or longer. Leaves 
unknown ; corymbs few-several-flowered, short-peduncled ; pedi- 
cels 5-12 mm. long; sepals about 6 mm. long, elliptic-ovate, obtuse 
or rounded; corolla tubular-funnelform, glabrous, pink with a 
purple throat, 3-4 cm. long, its tube very narrow within the calyx, 
gradually enlarged above, its limb about 1.5 cm. broad; capstile 
