844 MINNESOTA BOTANICAL STUDIES. 



EUPHORBIA L. Sp. PI. 450. 1753. 



Euphorbia atrococca n. sp. {Plate L.) 



A small tree, about ten feet high, with brownish bark; freely 

 branching above; secondary branches numerous, with moder 

 ately long internodes, glabrous; leaves numerous, but not 

 crowded, narrowly obovate, the largest an inch and a half 

 long, five-sixteenths of an inch wide, dull green, coriaceous, en- 

 tire, midrib prominent, but veins obscure; petioles an eighth 

 of an inch in length; stipules very short, broadly triangular, 

 slightly fringed; flowers axillary, or a few terminal, numerous 

 on short peduncles; capsule black or dark brown, pubescent, 

 slightly keeled, on nodding stalks which are slightly longer 

 than the pedicels; seeds pitted and rugose. 



A species obviously related to E. celastroides^ but the branches 

 with shorter internodes, and the capsule dark and pubescent, 

 and likewise keeled. It is never found below an elevation of 

 3000 feet, while E. celastroides is a plant of low elevations. The 

 type is No. 2500, collected July 4th, on the ridge west of the 

 Hanapepe river, Kauai, at an elevation of 300C feet. 



On Kaholuamano, above Waimea, was collected a form, No. 

 2858, which is referable to this species. The leaves are fewer, 

 shorter, broader, darker green, with veins more prominent, 

 but it has the same dark, pubescent capsule. A well marked 

 form, growing at an elevation of 4000 feet, near the edge of 

 the woods. 



Euphorbia celastroides Boiss. DC. Prodr. 15: Part 2, 11. 



1862. 



A small tree, with short trunk; loosely branching. The sec- 

 ondary or young branches are stiff, with short internodes. 

 These specimens, which answer very well to the description of 

 E. celastroides, were collected on a sparsely wooded slope along 

 the Hanapepe river, Kauai, at an elevation of 700 feet. Pretty 

 conclusive evidence that it is the same as Boissier's plant, is 

 the fact that the types were collected on Niihau and Kauai by 

 Remy. Plants which occur on both Kauai and Niihau, must 

 necessarily be only those which grow at low elevations, as 

 Niihau nowhere has an elevation of more than 1000 feet. Noth- 

 ing like it was seeu on Oahu, although Hillebrand records it 

 from the valley of Niu. 



June 24 (2429). 



