KEY TO SUB-CLASSES, ORDERS AND GENERA, 149 
XLIII—LEGU MINOS #—cont. 
B—CAESALPINE®—cont. 
(3) Pod winged on one suture only ; climber :— ... ecexl—Mezoneurum. 
(4) Pod indehiscent, samaroid, 1l-seeded with large terminal oblique 
wing; climber :— _.. eeexli— Pterolobium. 
*(ii) Calyx 5 cleft to base, segments narrow valvate ¢ or r slightly overlapping :— 
(1) Main rachis dwarfed spinescent, pinnas (4—8) simulating a fascicle 
of simply pinnate leaves, each with a broad flat rachis and minute leaflets ; pod 
moniliform :— + me wa ... ccecexliv—Parkinsonia, 
(2) Main rac his distinct and long i— 
(A) Petals orbicular subeqnal, pod flat :—: abe .. ecexlii—Poinciana. 
(B) Petals very unequal; pod turgid :— os .- cccexliii—Colvillea, 
(iii) Calyx campanulate, flowers in dense spikes :— 
(1) Stamens 10, prickly climber :— J ais ... eccexlyi—Wagatea, 
(2) Stamens 5; large tree :— be ceclxvi—Acrocarpus. 
(IT) Teves simply (usually pari) pinnate ; sometimes 2 foliate, but leaflets distinct ; 
and usually penninerved : 
(i) Petals 0, caly x often coloured :-~ 
(1) Perfect stamens 19 ; leaves 2-foliate or with 2-8 pairs of leaflets ; 
pod dehiscent at seed bearing apex :— ... eecl—Herdwickia, 
(2) Perfect stamens 5, leaflets opposite 2--8 pairs; pod indehiscent, pulpy 
within :— ... eccliiimCeratonia. 
(3) Perfect stamens 2—8, long exserted; leaflets opposite 3--6 pairs, pod 
flat, dehiscent, sty ea pulp :— .. ceclii—Saraca. 
(4) Bor fect staméns 2; leafiets alternate, 75 pairs with a terminal one ; 
pod indehiscent, pulpy within :— .» ecexlix—Dialium. 
(iii) Petals 8--5, or 5 with 2 more or “Tess abortive ; ‘stamens 10, of which 1—8 
often reduced to staminodes : -- 
(1) Pod indckiscent :— 
(A) Pod thin, flat, marrow elliptic; leaflets 3--4 pairs obcordate 
flowers racemed :- ..  ecexliiimHamatoxylon. 
(B) Pod oblong, with as epicarp, and pulpy or (later) mealy 
mesocarp ; leaves bifoliate; flowers racemed or panicled:—cccli-H ymenza. 
(C) Pod thick, oblong, with brittle epicarp, and pulpy mesocarp, septate 
within ; leaflets 10--20 pairs ; flowers racemed :— cccly—Tamarindus, 
(D) Pod turgid, suboyoid or subreniform ; leaflets 1--8 pairs ; flowers 
corym bose or racemed :— Stk eceslviii--Cynometrio 
(2) Pod dehiscent, or if indehiscent (Cassia, sometimes) thin long cylindra. 
and septate within :— 
(A) Pod flat, oblong ; leaflets large, 6—8 pairs ; flowers racemed :— 
coclii ( bis.) —Amherstia, 
(B) Pod scimetar shaped, flat ; leaflets 4—12 puirs ; flowers capitate :-— 
cccliv—Brownea. 
(C) Ped ligulate—oblong ; leaflets 2-foliate or 2-—-5 pairs usually withe 
spur-like stipules ; flowers racemed ; stamens long exserted :— 
ecclvi—Humboldtia. 
(D) Pod ligulate, or indehiscent and long cylindric and septate within; 
leaflets 3-20 (1 species 30--50) pairs, often with glands on the 
rachis, flowers racemed or panicled, stamens not exsSerted :— 
eccxlvii—Cassia. 
(III) Leaves 2-foliate with usually connate leaflets giving the appearance of 
a simple leaf more or less lobed at apex, palmately costate from the base; petals 
and calyx-lobes 5 ; stamens free, 10 (but 1, 3, or more only rey pod ligulate as 
a rule, dehiscent :— BS ei Hee Ay #e .. occlvii— Bauhinia. 
O—MImose#, 
[Anatomical features.-Most trees of this suborder have 2 distinct dark-coloured 
heartwood of the climbing species, Entada scandens has an anomalous structure, while 
the climbing Acactas have a hard normally ‘built wood, | 
[Botanical note.—The transference of Acrocarpus to the last suborder has already 
been explained ; Prain classes Parkia in the section with apioa] glands, ] 
(Tt) Stamens 10, anthers with deciduous apical glands :— 
(i) Unarmed ; leaves bipinnate :— f 
(1) Leaflets opposite :-— 
