ON THE FLORA OF BORNEO. 117 



RUBIACEAE. 



Uncaria, Schreber. 



Uncaria toppingii, sp. nov. 



Frutex scandens ramulis junioribus et foliis subtus in eosta 

 nervisque et pedunculis f errugineo-hirsutus ; foliis chartaceis, 

 in siceitate brunneis, oblongis, usque ad 10 cm. longis, basi 

 rottmdatis, apice tenuiter eaudato-acuminatis, nervis utrinque 

 7 vel 8; stipulis eirciter 1 cm. longis, bilobatis, lobis oblongo- 

 ovatis, acuminatis; capitulis longe tenuiterque pedunculatis 

 bracteis magnis involucrantibus instructis; floribus sessilibus, 

 ebracteolatis ; calyci dense appresse ferrugineo-hirsuto, lobis 

 lineari-lanceolatis tubum subaequantibus ; corolla eirciter 14 

 mm. longa, glabra; capsulis anguste ellipsoideis, eirciter 1 cm. 

 longis, quam pedicellis tenuibus brevioribus. 



A scanclent shrub attaining a height of about 3 m., the 

 younger branchlets, lower surface of the leaves on the midrib 

 and lateral nerves, and the long slender peduncles rather dense- 

 ly ferruginous hirsute with subappressed hairs. Branches and 

 branchlets slender, dark-brown, terete. Leaves chartaceous, 

 dark-brown when dry, 8 to 10 cm. long, 3.5 to 4.5 cm. wide, 

 the upper surface glabrous except the somewhat hirsute mid- 

 rib, base rounded, apex slenderly caudate-acuminate; lateral 

 nerves 7 or 8 on each side of the midrib, prominent on the 

 lower surface, curved-ascending, anastomosing, the reticula- 

 tions subparallel; petioles pubescent, about 5 mm. long; 

 stipules cleft, the lobes about 1 cm. long, oblong-ovate, acu- 

 minate, sparingly ferruginous-hirsute ; hooks slender, recurved, 

 stiff, about 1 cm. long. Heads solitary, axillary, in anthesis 

 about 3.5 cm., in fruit about 5 cm. in diameter, their slender 

 peduncles 6 to 8 cm. long, each head subtended by an involucre 

 of 4 or 5 bracts, the bracts villous externally, 10 to 13 mm. 

 long, oblong-ovate, acuminate, membranaceous, the margins 

 below rather coarsely lobed, the basal portions united. Flowers 

 numerous, greenish-white, ebracteolate, sessile or nearly so, 

 the calyx-tube densely appressed ferruginous-hirsute, the lobes 

 5, linear-lanceolate, acuminate, 3 to 4 mm. long, about equal- 

 ling the tube. Corolla-tube glabrous or nearly so, slender, 11 

 to 12 mm. long, the lobes elliptic-obovate, rounded, about 3 

 mm. long. Style exserted about 6 mm., the stigma narrowly 

 obovoid-oblong. Capsules narrowly ellipsoid, narrowed at both 

 ends, about 1 cm. long, their pedicels slender, equalling or 

 slightly exceeding the capsule. 



British North Borneo, Mount Kinabalu, Kiau, Top- 

 ping 1519, Xovember 1, 1916, on hillsides, altitude about 900 

 meters. 



A species in the alliance with Uncaria glabrata, DC, well 

 characterized, however, by its long and slender peduncles. It 

 differs from de Candolle's species also in its more numerous 

 nerves, and in many details of its flowers. 



E. A. Soc, No. 76, 1917. 



