Rubiaceae. 



true B. elatior, with smaller leaves, and fruits with only two pyrenae. The 

 whole aspect of the tree is different from the true B. elatior occurring 1000 feet 

 higher. 



Hillebrand enumerates a variety (3. ~brevipes, and gives the length of the 

 peduncles at 3 lines or 6 mm; in a foot note, however, he states: "the single 

 flowers are on a peduncle of 12 to 20 lines or 24 to 40 mm. 



On the Island of Molokai in various districts, as in Wailau Valley, Mapuleho, 

 and Kaluaha occurs a species of Bobea which at first glance would appear to be 

 B. elatior. However, the flowers are single and usually with 11 pyrenae. The 

 tree is entirely glabrous in all parts. It may be Gray's B. brevipes, but his 

 description: " pedunculis brevibns uni/loris?" would speak against it, and there- 

 fore the writer would suggest the name: Bobea elatior Gaud. var. Molokaiensis 

 Rock var. nov. The type is 7028 in the College of Hawaii Herbarium. Col- 

 lected flowering and fruiting Wailau Valley, Molokai, April, 1910. It is a small 

 tree about 20 to 25 feet in height with a slender straight trunk. 



On the Island of Kauai the writer observed several trees of Bobea, one oc- 

 curring in the mountains of Halemanu in the dense forest, a rather large tree 

 with a broad round crown. It is known to the natives as Akupa. Its leaves 

 are ovate, bluntly acute, or obtuse or rounded at both ends and are on petioles 

 of 4 mm, or even subsessile, the branchlets, petioles and leaves are hirtulose with 

 whitish hair. As the tree was neither in flower nor in fruit its diagnosis is un- 

 certain ; it will probably prove to be a new species of Bobea when complete ma- 

 terial is at hand. 



On the lower mountain slopes back of Makaweli, Kauai, occur a few small 

 trees which may be referred to Hillebrand 's Bobea Mannii, though all peduncles, 

 which are rather short, drooping and hirsute, are single flowered and would 

 therefore come under Gray's B. brevipes. There is however some doubt in the 

 writer's mind in regard to the specific value of Bobea Mannii which, with the 

 exception of the three flowered inflorescence, agrees well with Gray's B. brevipes. 

 Until the type material can be examined, these questions cannot be definitely 

 settled. 



Bobea Hookeri Hbd. 



Aliakea. 

 (Plates 181, 182, 183.) 



BOBEA HOOKERI Hbd. Flora Haw. Isl. (1888) 175; K. Schum. in Eiigl. et Prantl 

 Pflzfam. IV. 4. (1891) 96. Rhytidotus sandwicensis Hook. f. Icon Plant. (1870) 

 tab. 1071; Del Cast. HI. Fl. Ins. Mar. Pae. VI. (1890) 192. 



Branches and branchlets terete, the latter nodose, stipules triangular puberulous, 4 

 mm; leaves ovate, slightly and irregularly crenulate, or with a transparent wavy margin, 

 acuminate. 6 to 9 cm long, 3 to 5 cm wide, chartacous, with pellucid veins, dark green 

 above, lighter underneath, with reddish midrib and petioles, the latter 6 to 12 mm, pubes- 

 cent, as are the young leaves; flowers single, usually axillary or in the axils of fallen 

 leaves, on peduncles of 1 mm to 2.5 cm and even slightly longer; calyx-tube 3 mm, pubes- 

 cent, with 4 many-nerved ovate-oblong lobes of 4 to 5 mm, reticulately veined; corolla tube 



441 



