1958] 



THE BOTANY OF THE GUAYANA HIGHLAND — PART III 



135 



Mandevilla turgida Woods. 



VENEZUELA: Amazonas: Maffuire, Cowan 4' Wurdack 30675, Cerro Yapaeana, Rio 

 Orinoco, occasional, cumbre, 1200 m alt., Jan 3, 1951, woody vine, flowers yellow with corolla- 

 tube base and outside orange. Cowan Wurdack 3106S, Serrania Paru, Rio Paru, Cano Asisa, 

 Rio Ventuari, infrequent, west rim in cumbre, sabanita just north of head of valley of Camp 

 Cano, sabanita and scrub forest, 2000 m alt., Feb 2, 1951, unbranched shrub 0.2-1 m tall, 

 corolla yellow with outside of tube bronze. Bolivar: Maguire 32762, Cerro Guaiquinima, Rio 

 Paragua, frequent, rocky elevation, Cumbre Camp, 2000 m alt., Dec 25, 1951, subshrub to 7 dm 

 high, flowers yellow. Maguire 32949, Cerro Guaiquinima, Rio Paragua, frequent in thickets and 

 open savanna, North Valley, 1600-1700 m alt., Jan 4, 1952, shrub or seandent vine, 5-10 dm 

 high, flowers yellow. 



The collections from the type locality, 329 \9 and 32762, were compared with 

 the type (flowers poor) at USXH. The leaves vary from elliptic to obovate, 

 from typically acntish at the apex to rounded. The proper tube ( inf rastaminal 

 quinima collections. The tube proper is about 2 cm long, the throat 1.7 cm long, 

 The ovary is sparsely hairy. The collection 31144 is a large-flowered form. The 

 corolla is larger than described for the species or those of the Maguire Guai- 

 quinima collections. The tube proper is about 2 cm long, the throat 1.7 cm long, 

 the corolla-lobes 1.5 cm. The collection from Yapaeana, 30675, differs somewhat 

 from the typical form; stem not as densely pubescent; leaf-blades obovate, 

 acutish at the base and running into the petiole ; sepals smaller and blunter, 1 

 mm long, rounded to obtuse at the apex ; ovary puberulent. The leaves of 31068 

 are sometimes ternate. 



Mesechites acutisepala Monachino, sp. now Figure 16. 



Fr'utex scandens gracilis; foliis oppositis chartaceis non nitidis; petiolis 5-15 

 mm longis; laminis lanceolatis, 4.5-11 cm longis, 1.5-3 cm latis, ad basin obtusis 

 vel subrotundatis, ad apicem acuminatis ; nervis secundariis principalibus utro- 

 que 10-15 paene rectis, prope marginem arcuatis; venis tertiariis obscuris, 

 glandulis ad basin laminae 2 vel 4, pectinatis; floribus aggregatis; pedicellis 

 usque ad 6 mm longis; lobis calicis lanceolatis ca. 4-5 mm longis, ad apicem 

 angustatis acutisque ; tubo corollae 1.5 cm longo (floribus nondum expansis), 

 extus glabro, intus insertio staminum pubescenti ; lobis corollae (in alabastro) 

 4.5 mm longis; staminibus ca. medio tubi corollae insertis; antheris 4 mm longis 

 glabris, lobis basilaribus obtusis ; ovario glabro; nectarinis 5. 



Slender vine, the stem glabrous or sparsely puberulent-hirtellous, moderately 

 lenticelleci, the nodular appendages inconspicuous, deltoid, less than 0.5 mm 

 long, easily lost; leaves opposite, chartaceous, dull; petiole 5-15 mm long, chan- 

 nelled above ; blades lanceolate, obtuse to subrounded at the base, acuminate at 

 the apex, 4.5-11 cm long, 1.5-3 cm wide, faintly puberulent along the midrib, 

 the principal secondary nerves about 10-15 pairs diverging from the midrib 

 almost at right angles and straight for a considerable distance before arching 

 near the margins, tertiaries faint ; glands at the base of the blade 2 or 4, pecti- 

 nate, conic,, up to 1 mm long; flowers greenish, clustered at the apex of an 

 axillary peduncle 2-9 cm long, the pedicel up to 6 mm long; calyx-tube about 

 1.7 mm long, squamellae within at the apex to about halfway down the tube, 

 the calyx-lobes oblong or deltoid-lanceolate, narrowed and acute at the apex, 4-5 

 mm long, ciliolate ; corolla pale pink below, salverform, the throat slightly 

 dilated, the tube 1.5 cm long (flowers not expanded), glabrous outside, pubescent 

 at the insertion of the stamens within, the corolla-lobes dextrorsely contorted, 

 4.5 mm long (in bud) ; stamens inserted at about middle of the corolla-tube, the 

 anthers 4 mm long, glabrous ; nectaries 5, concrescent at the base. 



