100 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



hnear, 1.2 mm. long, adhering through their base to the gynostegium and slightly 

 surpassing it. Pollinia small, ovoid (about 0.09 mm. long, 0.04 mm. broad), hanging 

 from two short eaudicles (about 0.024 mm. long); corpuscle broadly ovate (about 

 0.07 mm long, 0.045 mm. broad). Gynostegium 1 mm. long. Stigmas obtuse. 



follicles not known. 



A species of the section Orthotassa. 



Colombia: El Saladito above Calf, on the road to Buenaventura, Western Cordil- 

 !xf o 0f XT C ° l0mbia - altitude > !»«» meters, Pittier, 754, flowers, December 21, 1905 

 (U.S. National Herbarium no. 530945, type). 



Cynanchum reflexum (Hemsl.) Pittier. F 



Gonolobus refiexus Hemsl. Biol. Centr Amer 2- 333 

 1382. 



Stems sublignose, little ramified, erect or spreading 

 but scarcely voluble, covered with long, whitish, artic- 

 ulate hairs. 



Leaves also densely strigose-hairy, rather thick; 

 petioles short (1 to 1.5 cm.); leaf blades ovate-lanceolate,' 

 6 to 10 cm. long, 2.5 to 5 cm. broad, rounded at base 

 with two petiolar glands, acuminate, paler beneath. 

 Cymes 4-flowered, umbellate, axillary, almost sessile. 

 Pedicels 2 to 3 cm. long, strigose-hairy. Calyx small 

 (4 to 4.5 mm. from base to tips), strigose-hairy outside, 

 smooth inside with 5 small glands alternating with the 

 lobes, these narrowly lanceolate, 3 mm. long. Corolla 

 rotate, greenish, finely brown-reticulate within, sparsely 

 hairy outside, with a very short but distinct tube and 

 a glabrous throat; lobes 7.5 long, 3 mm. broad, oblong 

 with rounded tips, reflexed. Corona simple, oupulifornC 

 2.5 mm. high, appendiculate inside, with 10 larger tips 

 ending nbrovaseular fascicles and separated by smaller 

 membranous teeth. Gynostegium stipitate, the stigma 

 almost even with the tips of the corona. Anthers with- 

 out appendages. Retinaculum 0.26 mm. long, 9.16mm. 

 broad; eaudicles broadly winged; pollinia pear-shaped, 

 more or less deflexed, about 9.7 mm. long. 

 Follicles unknown. 



Costa Rica: Bushes at Las Vueltas de Tucurrique, 

 Reventazon Valley, at 600 to 700 meters above sea 

 level, Tonduz, flowers, January, 1899 (Instituto fis.- 

 geog. Costa Rica no. 13004). 



Notwithstanding some small discrepancies, the 

 identity of this species, as established by Mr. Donnell- 

 Smith, with the one from Chontales (Nicaragua) described by Mr. Hemsley under 

 the name of Gonolobus refiexus, is pretty certain. But our plant differs so much, 

 in its habit and the structure of its flowers, from the remaining Gonolobi of Cen- 

 tral America, that the propriety of placing it in this genus is doubtful. The small 

 flowers with minute calyx and reflexed lobes of the corolla are unusual in the latter. 

 By the elongated, cuplike corona, with inner appendages each division of which 

 is marked by a bifurcated fibrovascular fascicle ending in two large teeth, by the 

 small size of the translatorium and the peculiar shape of its retinacle, and last by its 

 stellate stigma, our plant comes nearer to the section Vincetoxicum of the genus 



F IG - 7.— Flower parts of Cynanchum 

 reflexum. a, Lobe of calyx; b, 

 lobe of corolla; c, part of corona, 

 outside view; d, trarislatorium; 

 e, stigma; /, styles, a-c, e, f, 

 Scale 5; d, scale 19. 



