326 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



third gradually contracted, then suddenly distended by the 

 anthers and again contracted. Open flowers not seen, the lobes 

 in the mature bud 7 mm. long. Dissection material wanting. 

 Young follicles nearly 2 dm. long, slender, monilif'orm. 



Ixiamas, 800 feet, 0. E. White, December 11, 1921 {no. 1142). 

 "A slender, woody vine in marshes. Flowers yellow, lined 

 faintly with red on corolla-lobes." This plant is closely related 

 to Echites or Mandevilla holiviana, and also M. tenuicarpa. It is 

 probable that none of the three belongs to either of these genera. 

 The heterogeneous aggregation of species now grouped in 

 "Echites" undoubtedly comprises several good genera, and any 

 reference of the species of the E. holiviana group to either genus 

 must be regarded as provisional. 



Dipladenia rotundifolia 



Tomentose throughout. Stems simple, erect, to, nearly 1 

 meter high, terete, leafy, the upper and lower leaves smaller, the 

 base bearing a few roundish, scale-like leaves. Petioles almost 

 wanting. Largest blades about 8 cm. long, rotund, subcordate, 

 the summit usually very shortly mucronate, often emarginate ; 

 more or less ferruginous beneath, where the midrib is prominent. 

 Secondaries 10 or 12 on each side, strongly falcate, more or less 

 connected by crooked tertiaries. Flowers few, in a long- 

 peduncled terminal raceme. Bracts very small, subulate, rigid. 

 Pedicel stout, erect, terete or angled above, about 1 cm. long. 

 Calyx deeply parted, the spreading rigid lobes about 5 or 6 cm. 

 long, ovate, the strong midrib terminating in an awn-like sum- 

 mit. Corolla rose-colored, the tube 1 cm. long, 3 mm. broad, 

 slightly dilated above, the throat infundibular, 3 cm. long, 1 cm. 

 broad at the middle, the limb 4 or 5 cm. broad, the 5 lobes broad 

 and rounded. Dissection material wanting. 



Ixiamas, 800 feet, 0. E. White, December 16, 1921 {no. 1144). 

 ' ' An herb, 3 to 4 feet high, with milky juice, growing in full sun- 

 shine, on pampas, in sandy loam. Xot common." Species very 

 near D. tetradenia Rusby. 



Rhabdadenia mamorensis 



Gla1)rous. Stems slender, strongly twining. Petioles slen- 

 der, 5 to 10 mm. long. Blades to 1 dm. long and 2 cm. Avide, 

 mostly divaricate. Base cordate, with short and narrow sinus 



