)ra Petelotii sp. nov. l/Vje^A* ^^/./^ i^;é)5«l?^^ 



)a parva, annua, erecta, circiter' 9 cm. alta, simplex vel parce 



,, caulibus teretibus, glabris vel parce ciliatis, haud 1 mm. dia- 



foliis inferioribus ovatis vel oblongo-ovatis, acutis, usque 



64 JOURNAL OF THE ARNOLD ARBORETUM [vol. xix 



ad 1.7 cm. longis et 1.2 cm. latis, parce ciliatis, nervis utrinque circiter 

 3, petiolo usque ad 2 mm. longo; bracteis bracteolisque foliaceis, per- 

 foliatis, orbicularibus, reticulatis, glabris, 1 ad 1.5 cm. diametro; iîoribus 

 albidis, solitariis, 1.4 cm. longis, 5-meris, calyce cylindrico, 6 mm. longo, 

 dentibus acutis; corollae tubo calycem aequante, lobis 5, oblongis, 

 obovatis, rotundatis, 7 mm. longis, 4-4.5 mm^. latis, tenuiter 8-nerviis; 

 staminibus 5, 3 brevioribus corollae tubum subaequantibus, 2 longioribus 

 distincte (3-4 mm.) exsertis. 



Indo-China, Laos, Province of Cammon, Kouan Pha Vang, A. 

 Petelot 4327, November, 1930. A rare plant growing on calcareous rocks 

 at an altitude of about 140 m. 



This species superficially suggests a dwarfed form of Canscora per- 

 jorata Lam. and C. Wallichii C. B. Clarke, of India, differing markedly 

 in its small size, terete, not 4-winged stems, and its 5-merous flowers. 

 It is not closely allied to any of the other 5 species of the genus recorded 

 from Indo-China. Représentatives of the genus normally hâve 4-merous 

 fiowers, but this species is anomalous within the genus, as is the totally 

 différent C. pentanthera C. B. Clarke of the Malay Peninsula, in its 

 5-merous flowers. 



