Rutaceae. 



here was collected along the Honomanu trail on the northern slopes of Mt. Ha- 

 leakala, Maui, elevation 2500 feet, with enormous leaves 20 cm wide; another 

 form at 4000 feet elevation on the same island in the forests near Olinda, with 

 smaller leaves, flowering, September, 1910 ; no. 8534. 



Hillebrand's var. y. macroplnjlla with large glabrous leaves is from Kauai. 



On the Island of Hawaii, in the Kohala Mts. proper, west of Honokanenui gorge, 

 the writer collected specimens of a tree 15 to 20 feet high, with very robust 

 branches ; the leaves are glabrous, thick coriaceous, and probably belong to Hille- 

 brand's var. y. The leaves are on petioles of 5 to 5.5 cm and differ therefore from 

 the latter variety, which has the leaves on short petioles of 6 to 8 mm; it may 

 be known as forma coriaceum f. nov. 



Collected June, 1910, fruiting, no. 8367, in College of Hawaii Herbarium. 



Var. sessilifolia Rock var. nov. 



A shrubby plant, with erect stems foliose at the apex; leaves large, opposite, per- 

 fectly sessile with a broad base, oblong or obovate oblong, gradually tapering toward the 

 base, very thin chartaceous, transparent, midrib and veins prominent, rounded at the 

 apex, glabrous above, pubescent underneath, 26 to 38 cm long, 9 to 14 cm wide, flowers 

 as in the species, the petals acute; capsule exceedingly large, the erect cocci separated by 

 a very broad sinus of 4 mm. 



Collected in the dense forests of the summit mountain of the Kohala range, 

 Hawaii, fruiting July 12, 1909, type no. 4222 in the College of Hawaii Her- 

 barium. 



EUPHORBIACEAZ. 



This is an exceedingly large family, consisting of more than 208 genera with 

 many species, distributed over all parts of the world, with the exception of the 

 Arctic and Alpine regions. 



The genus Euphorbia is the most widely distributed of the family, reaching 

 as far as the polar borders of the northern and southern hemispheres. 



In the Hawaiian Islands the family is represented by five genera, four of 

 which have arborescent species. 



KEY TO THE GENEEA. 

 Plants not milky: 



I. PHYLLANTHEAE. Flowers monoecious or dioecious; ovary cells two-ovulate: 

 Leaves alternate entire, fruit a berry, three celled, seeds arillate. . . . Neowawraea 



Leaves alternate, entire; fruits flat, one-seeded Antidesma 



U. CROTONEAE. Flowers monoecious or dioecious; ovary cells one-ovulate: 

 Leaves alternate, crenate or serrate; fruits capsular, two-three celled 



Claoxylon 



Leaves alternate, lobed; stone fruit one-seeded, splitting into two-four cocci 



Aleurites 



Plants milky: 



III. EUPHORBIEAE. Flowers mostly monoecious, rarely dioecious; ovary three 



celled, one-ovulate: 

 Leaves opposite, linear; fruit a three celled capsule Euphorbia 



NEOWAWRAEA Rock gen. nov. 



Flowers dioecious. Male flowers: sepals 5, of unequal shape and size. Petals none. 

 Stamens 3' to 4, rarely 5, inserted between the sinuses of the hypogynous disc, consisting 



243 



