19 



Ryan and Kerr, in their paper on the Dipterocarpaceae of 

 Northern Siam in Journal Siam Soc, vol. viii,, describe D. oMusi- 

 folius as having " the young- shoots, petioles, stipides and inflore- 

 scence densely clothed with long tawny fascicled hairs," and 

 describe a variety snbnudus which has the young shoots and 

 stipules quite glabrous, the petiole glabrous for the greater part of 

 its length, and the calyx tube quite glabrous or silky pubescent. 



Hosseus, ii. p. 413, refers his 298 to D. Duperreanus, Pierre and 

 says that that species is very closely allied to D. obtusifolius. So 

 far as the material in Herb. Kew goes, it appears advisable to the 

 writer to follow the first-named authors and regard the one plant as 

 a variety of the other. The two plants apparently bear exactly 

 the same relationship to each other as Pentacrne siamensis does to 

 its variety mekongensis, 



Dipterocarpus tuberculatus, Roxh. — F.B.I., i. p. 297 ; For. Fl. 

 Burma, i. p. 113 ; Brandis, Journ. Linn. Soc, xxxi. p. 32 ; Fl. 

 Indo-Chine, i. p. 361 ; Williams, Bull. Herb. Boiss., v. (1905) p. 26 ; 

 Hosseus, ii. p. 414. 



Chiengmai, on lower slopes of Doi Sootep, 300-450 m., Kerr, 

 1066 ; Korat, 60-90 m., Witt ; Teysmann, 5932 in Herb. Bog. 

 sine loc. 



Distr. Burma, Cochinchina. 



Lao name, Mai Tiing (ex Kerr). 



Here again there are two varieties bearing the same relationship 

 to each other as in the case of D. obtusifolius and Pentacrne 

 siamensis. The tomentose form has been named var. tomentosus by 

 Ryan and Kerr I.e., p. 4. Large suites of specimens have been 

 received lately at Kew from Dr. Kerr and to the writer these bear 

 out the advisability of following the treatment proposed by Ryan 

 and Kerr. 



Dipterocarpus turbinatus, Gaertn. — F.B.I., i. p. 295, e. p. ; For. Fl. 

 Burma, i. p, 114; Brandis, Journ. Linn. Soc, xxxi. p. 27; 

 Hosseus, ii. p. 414 ; Ryan et Kerr, Journ. Siam Soc, viii. p. 3. 

 D. laevis, Ham. — For. Fl. Burma, i. p. 114. 



Chiengmai, Doi Sootep, 600 m., Kerr, 1152; Kau Phra Dang, 

 Uosseifs. 



Distr. Assam, Burma, Malacca. 



Lao and Siamese name, Mai Yang (ex Kerr). 



Shorea floribunda, Kirz ex Dyer, F.B.I., i. p. 304; For. Fl. 

 Burma, i. p. 119; Brandis, Journ. Linn. Soc, xxxj. p. 85; 

 Hosseus, ii. p. 414 ; Ryan et Kerr, Journ. Siam Soc, viii. p. 6. 



Chiengmai, Doi Sootep, 300-800 m., Kerr, 527, 567, Hosseus, 

 427 ; Phre, 135 m., Luang Vanpruk, 131. 



Distr. Burma. 



Lao name, K'Yawm (ex Kerr). 



Shorea obtusa, ^r«//.— F.B.I., i. p. 306 ; For. Fl. Burma, i. p. 11 8 ; 

 Brandis, Journ. Linn. Soc, xxxi. p. 80 ; Fl. Indo-Chine, i. p. 378 ; 

 Ryan et Kerr, Journ. Siam Soc, viii. p. 6. 



Chiengmai, lower slopes of Doi Sootep, 300-600 m., Kerr, 549 ; 

 Phre, 150-450 m,, Luang \'anpruk, 195. 



Distr. Throughout Indo-Cliina, East India. 



Lao name, Mai Ngaa (ex Kerr). 



21218 B 2 



