152 Journal of the F.M.S. Museums. [Vol. VI, 



thin nerves, 3 inches long, i inch across ; petiole ^ inch long, 

 the small leaf sessile, lanceolate-acuminate, f inch long, ^ inch 

 wide. Stipules ovate, obtuse. Flowers about 4 on a peduncle, 

 an inch long, with 4 stipuliform bracts about halfway up, 

 glabrous below, pubescent above the bracts. Floral bracts 

 linear, j^^ inch long. Pedicels ^ inch long, pubescent. Calyx 

 •campanulate, hairy, ^ inch long, the lobes lanceolate-acuminate, 

 nearly as long as the tube. Corolla white, half an inch cicross; 

 tube very short ; lobes 5, lanceolate-^icuminate, acute. Stamens 

 as long as the petals, lanceolate-acuminate, beaked. 



In thick woods on the bank of the Teku River at about 

 4,600 feet altitude. 



This is most nearly allied to A. Hookeri, King, but the 

 leaves are larger and more remote and the flowers are smaller. 



*68. Akgostemma Yappii, King; Ridley, op. cit. p. 311. 

 Common in shady wet spots up to 7,100 feet elevation on 

 Gunong Tahan. 



Distribution. Hills of the Malay Peninsula. 



*69. Hedyotis patens, Ridl. op. cit. p. 311. 

 A very common plant from Wray's Camp, 3,300 feet 

 elevation, to the top of Gunong Tahan, in open places among 

 low bushes. The plant is very variable in size, tall with a 

 widely spreading panicle in the denser thickets by Wray's 

 Camp, short and more compact in leaf and panicle in the open 

 dry Padang. I never saw it creeping, as described by 

 Robinson. The petals are usually greenish white, occasion- 

 ally purplish, and when open are curled back so as to expose 

 the long projecting stamens. These are extended in a hori- 

 zontal direction, the two lower ones slightly longer than the 

 three upper ones. The anthers are purple. The flower opens 

 in the morning very early, and the petals curl back. The 

 stamens are projecting and the style is only § of the length of 

 the stamens. On the second da)^ the stamens are withered 

 and the style is now considerably longer than them and is pro- 

 jecting horizontally. In the ordinary species of the genus the 

 short stamens hardly protrude their tips from the mouth of 

 the tube and the petals are not recurved, and they do not 

 appear to be visited by Hymenoptera. The structure of the 

 flower of Hedyotis patens appears to be unique in the genus. 

 The flowers, which are very inconspicuous, are visited and 

 regularly pollinated by a species of Bombus. This insect 

 spends the whole day, from shortly after sunrise to sunset, at 

 these flowers, almost to the exclusion of any other flower, 

 wherever the Hedyotis is abundant. I have, however, seen it 

 at work on Xyris grandis, Melastoma longisepala, and Bneckia. 

 It does not fly from one species to another, but confines its 

 attentions to the Hedyotis or Xyris as long as there are any in 

 the vicinity. In attacking the Hedyotis, it clings to the 

 branches of the cyme and inserts its proboscis above the 

 stamens, in such a way that the anthers brush the underside 

 of the abdomen. It visits also flowers in which the stamens 



