846 MINNESOTA BOTANICAL STUDIES. 



forms occur there, except E. celastroides, recorded from the re- 

 mote valley of Niu, into which it is hardly possible that Lay 

 &, Coolie penetrated. It is plentiful about the rocky slopes of 

 Nuuanu Pali, and here is where Lay & Coolie probably col- 

 lected their specimens. As described by Hillebrand, it is a 

 '•glabrous shrub, 2-5 feet high." 

 April 23 (2199). 



Euphorbia pilulifera L. Sp. PI. 454. 1753. 



An introduced species, which is very common in the "low- 

 land zone." It occurs as a dwarf in the hot and dry regions 

 about Salt Lake and Diamond Head, and is also found growing 

 luxuriantly in moist, cultivated ground. 



March to August (1980); original locality, "in India." 



Euphorbia rivularis n. sp. {Plate LI.) 



A shrub, five or six feet high, simple below, with a stem al- 

 most an inch in diameter; branches loose, spreading, somewhat 

 drooping, with short internodes; leaves regularly opposite, 

 standing at right angles to the branch, except the ultimate 

 ones, which extend forward, oblong, usually slightly curved, 

 two inches long, six sixteenths of an inch wide, glabrous, pale 

 green above, lighter beueath, blunt and rounded at the end and 

 sometimes slightly retuse, somewhat narrowed and unequal 

 sided at the base; veins not prominent, at acute angles to the 

 midrib; petioles an eighth of an inch in length; stipules low, 

 broadly triangular or lunate, not fringed; inflorescence several 

 flowered; flowers on slender, angled pedicels; capsule very 

 short stalked, erect, glabrous. 



The type is No. 2441, collected on the banks of the Hanapepe 

 river, Kauai, at an elevation of about 600 feet. A species ap- 

 parently related to E. celastroides, but of a very different habit. 

 It is much smaller, more simple, and grows on rocks overhang- 

 ing the river. It is unique on account of the long, regularly 

 opposite leaves. 



Euphorbia sparsiflora n. sp. {Plate LII.) 



A glabrous shrub, ten inches to two feet high; stems slender, 

 branched, the branches ascending; bark grayish, or light 

 brown; leaves obovate, evenly narrowed to a wedge-shaped 

 base, rounded and blunt at the end, an inch or less in length, 

 on short petioles, a sixteenth of an inch in length, veins not 

 conspicuous; stipules low, broadly ovate, somewhat fringed; 

 flowers few, solitary in the upper axils; pedicels very short and 

 slender; capsule smooth, nodding, on a short, slender stalk. 



