XXX. LEGUMINOSiE 
109 
Leguminosae are divided into three Sub-orders : 
Corolla pea-shaped. Petals dissimilar .... I. Papilionacece. 
Corolla regular. Petals similar or nearly so. 
Flowers large, in clusters, racemes or panicles. Petals 
free. Stamens shorter or only slightly longer than 
the corolla . . . . . . .II. Ccesalpiniece. 
Flowers small, in heads or spikes. Petals united. 
Stamens much longer than the corolla . . . III. Mimosece. 
I. PAPILIONACECE. Flowers pea-like. Calyx usually bell- 
shaped and 5-toothed. Petals usually clawed, dissimilar, consisting 
of an upper one called the standard and two lower pairs, the wings 
and keel respectively : standard outermost, covering the others, 
usually broadly ovate, free or slightly adherent to the stamens ; 
wing-petals usually oblong, free or adherent to the inner petals ; 
keel-petals innermost, usually ovate, their tips more or less 
incurved and their lower margins more or less united. Stamens 
10, in Dalbergia only 9 ; all free, all united or united in two 
bundles of 5 each, or the upper stamen free and the others united ; 
the stamens if united sheathing the ovary and more or less free 
above the middle ; filaments usually thread-like, sometimes the 
alternate ones thickened towards the tip ; anthers usually uniform, 
sometimes alternately large and small. — The name Papilionacece is 
derived from the Latin papilio from the resemblance of the corolla 
to a butterfly. 
Papilionaceous flowers are all specialised in structure for fertilisation by 
insects ; the details varying in the different genera. 
A. Leaves simple 
Stamens all free. Leaves apparently whorled . 
Stamens all united. Leaves alternate 
Upper stamen free, others united 
Pod jointed. Flowers not enclosed within bracts. 
Petals shorter than the calyx 
Petals longer than the calyx 
Pod not jointed. Flowers enclosed within bracts 
B. Leaves compound 
* Leaflets two 
Stamens all united. Style glabrous 
Upper stamen free, others united. Style bearded 
2. Thermopsis. 
4. Orotalaria. 1 
21. Alysicarpus. 
23. DesmodiumJ 
37, Flemingia . 3 
17. Zornia. 
25. LathyrusA 
* * Leaflets three 
f Terminal leaflet stalked. (See also Trifolium minus.) 
Trees. 
Flowers white, pale pink or yellow- white. 
Stamens 10, upper one free, others united. Pod 
jointed 22. Ougeinia. 
Stamens 9, all united. Pod not jointed . . 38. Dalbergia. 5 
1 All species except C. medicaginea. 2 D. gangeticum only has simple 
l eaves. 3 F. fruticulosa only. 4 Species 2, 3 and 4. 5 Dalbergia usually has 5, 
sometimes 3 leaflets. 
