lulu, who called my attention to its presence on Mauna Loa, 

 The type material (No 8772) was collected when in company 

 with Mr. W. M. Giffard on the eastern slopes of Mauna Loa r 

 at an elevation of 4500 feet, in April, 1911. It is a remarkable 

 tree attaining a height of about 80 ft. with trunks of more than 

 four feet in diameter; it is plentiful in Kipuka Ki and Puaulu 

 on the land of Keauhou about 6-8 miles from the Kilauea Vol- 

 cano where it grows in company with Pelea, Ochrosia, Straussia, 

 Zanthoxylum, etc. One would not suspect to find such trees in 

 that locality as one travels for miles through Ohia (Mctrosideros 

 polymorpha) forest until all at once one strikes a grove of this 

 remarkable tree which is called A'e by the natives on Mauna 

 Loa, and Manele on Hualalai, North Kona. Unquestionably this 

 tree must have extended farther down the mountain where the 

 Ohia now grows, but was undoubtedly destroyed by -the a-a 

 (rough) lava flows from the flanks of the mountain. The few 

 hundred acres on which this tree is found escaped the firy stream 

 by their elevation, as no lava is visible, the soil being black and 

 rich. The tree seems to be deciduous, as I have observed speci- 

 mens with the leaves all yellow and dropping, while others had 

 young leaves only, but I have not met with any having the 

 branches entirely bare. 



On a subsequent visit (July-August, 1911,) specimens with 

 flower-buds were collected but being badly attacked by a species 

 of caterpillar it was impossible to make out the structure of the 

 flowers. 



The writer waited several weeks for the flowers to unfold, but 

 instead the whole inflorescenses began to wilt on every tree ex- 

 amined, due to the work of the caterpillar. 



Hibiscadelphus Rock gen. nov. 



Bracteolae 5-7, angustissimae lineares, liberae ; calyx profunde 

 et inaequaliter 2-3-fidus ; columna staminea infra apicem 5-denta- 

 tum antherifera; ovarium 5-loculare, loculis 1-3 ovulatis ; styli 

 rami 5, suberecti, apice in stigmata capitata dilatati ; capsula lignea 

 loculide 5-valvis, endocarpio chartaceo solubili ; semina reni- 

 formia, tomento albescenti-cano induta. Arbores mediocres cum 

 tomento stellate; folia cordata, inaequaliter crenata ; flores soli- 



