76 Leguminosae. 
LEGUMINOSAE 
Legume or Bean Family. 
The vast Legume or Bean Family is represented in the Hawaiian 
Islands by man)' introduced as well as native species ; the introduced 
species are much more numerous than the indigenous or native ones 
which have been treated in the writer's book, "The Indigenous Trees 
of the Hawaiian Islands." In the present volume only such of the 
introduced species are discussed or figured as are of arborescent char- 
acter and of more or less ornamental value. 
The family Leguminosae is divided into three very natural sub- 
families as follows: Mimosoideae with regular flowers, valvate petals, 
and definite or indefinite stamens; Caesalpinioideae with irregular 
flowers, petals imbricate, the upper petal innermost, sometimes re- 
duced to one or three and definite stamens; Papilionatae with very 
irregular petals, the flower butterfly-like, the upper petal outermost ; 
the stamens definite, their filaments variously united. All three di- 
visions have the characteristic pod or legume which may be dry or 
fleshy, dehiscent or indehiscent, and is variably one to many-seeded. 
Among the numerous species found in and about Honolulu the fol- 
lowing less conspicuous members are only mentioned here, as space 
forbids going into detail. 
In the Mimosoideae group belong the common Klu or Aroma, 
Acacia Farnesiana ( L. ) Willd., a much branched spiny shrub or 
small tree with fragrant globose, yellow flower heads. It grows in 
common with the Algaroba and frequents the arid regions. It is a 
native of tropical America. Mention may also be made of the two 
Australian wattles Acacia decurrens and Acacia dealbata both planted 
on Tantalus, as well as Acacia catechu. Albizzia lebbekoides is rare 
in Honolulu, the writer knowing only of one tree, in Mrs. Foster's 
grounds on Nuuanu Avenue ; it has finely pinnate leaves and nar- 
row thin papery pods. Albizzia stipulata, recognizable by its large 
conspicuous stipules, may be found in the Government Nursery 
grounds on King Street. Parkinsonia aculeata, an undesirable very 
spiny shrub, is of later introduction and was first planted by the 
army along the waterfront. Leucaena glauca, the Koa haole of the 
natives, is an introduced shrub more often a weed with rather large 
globose, white flower heads, found on the lower mountain slopes and 
waste places. Of the Caesalpinioideae may be found Intsia biiuga 
(Colebr. ) O. Kuntze, a native of tropical Madagascar and Poly- 
nesia; only one tree is known to the writer, growing in Hilo at St. 
Mary's School. To the Papilionatae belong the following species: 
