104 JOURNAL OF THE ARXOLD ARBORETUM [vol. i 



new trees (Sidcroxylojifermgineinn Hook. & Arn., Elacocarpus phot iniacf alius 

 Hook. & Arn.) andof an Evonymus, now considered a new^ species {E. hnninen- 

 si.s Koidz.), are given, lliis collection was the only one of im])ortance 

 made so far as I can discover until tlie Japanese began to take a serious 

 interest in botany. Some plants w^ere collected on the rommodore IVrry 



p]xpedition, for Gray in his Botany of Japan (;588) says, *']\Ir. Wright found 

 tlie Californian Photinia arbutifolla at the IJonhi IsLands along with the 

 Ostcomeles of the Sandwich Islands. On page 398 Gray describes a new^ 

 Composite as Ixeris? Ixcridium linguaejolia and says it was collected by 

 Wright in the Bonins. JNIaximowicz afterwards referred this plant to tlie 

 genus Crepis. Decaisne described the Thotinia mentioned by Gray as a 

 new^ species, under the name of Photinia Maximowiczii. In the Ajin. Sci, 

 Nat, ser. 5, xiv. 309 (1872) Planchon describes an endemic Rutaceous genus 

 Boninia with two species and mentions a sj^ecimen in Herb. Acad. l*etrop. 

 ;ind another in Herb. Ilook., no. 5G. It would appear that it w\as collected 

 by the Russians and possibly by Beechey. It is evident that men of the 

 ships wliich visited the Bonin Islands after Captain Beechey made collec- 

 tions of plants but they do not appear to have been systematically described. 



In the Journal of the College of Science, Tokyo, xxiii, art. 10 (1908) is a 

 phytogeographical article by H. llattori on a very elaborate plan but its 

 usefulness is curtailed l)y the author enumerating every name given to 

 Bonin ])lants irrespective of their correct api)lication. He enumerates 70 

 families comprising 164 genera and '■2'U) species as growing on the Bonin 

 Islands. Of these o4 species are Cryj)logams and 74 phanerogamous herbs. 

 Of the 9:2 woody ])lants 34 are now known to belong to other species and 

 eigfit arc suffruticosc, roadside weeds wide spread in the tropics. He re- 

 gards 11 species of woody plants as endemic. One family llattori includes 

 (Capparidaceae) must be eliminated, for the plant he refers to here {Corono- 

 pus didymus Smith) belongs to the Cruciferae. His ''Gardenia radicans" 

 is (i. augusia Merr. and his "Zanthoxylum i)iperitum" is the same as Z. 

 Arnottianum Maxim, both of Avhich he includes. 



In the last few years the Japanese botanists and especially Messrs. 

 jNIakiuo, Xakai and Xoidzumi, have described many new sj)ecics from the 

 Bonin Islands. Today the ligneous flora excluding those for ornamental 

 or testhelic purposes introduced by man is known to belong to 57 families 

 com]>rising 100 genera and 107 species and 5 varieties. Of these six are 

 now described for the first time in this Journal. These woody plants arc 

 divisible into 43 trees, 54 shrubs and 15 climbers. Of these one genus and 

 fifty-four species and four varieties are endemic, thirty species arc widely 

 spread in the tropics, and seventeen species grow also in south Japan, Liu- 

 kiu, Formosa and southern China. Considering the proximity to southern 

 Japan and Liukiu the number of species common to these areas and to the 

 Bonins is remarkably small. The Bonin Islands are really very isolated 

 and being entirely erupted from the ocean their origin sufficiently exolains 

 the high percentage of endemic plants; nevertheless, the flora is in all its 

 essential characters an outpost of the Chino-Malayan floras and is not 



