-XXV. PAPILIONACE, 101 
of the cavity. Style simple. Fruit a pod, usually opening 
in 2 valves. Seeds with 2 large cotyledons and no albumen. 
A very numerous tribe, widely distributed over the whole surface of the 
globe, and easily known by the peculiar form and arrangement of the 
petals, constituting the well-known peaflower called by botanists papilio- 
naceous, comparing it, by a not very intelligible stretch of imagination, to 
a butterfly. The whole family comprises two other tribes or sub- orders, 
chiefly tropical or southern: the Cesalpinia tribe, represented in our 
plantations by the Judas-tree (Cercis) and the Gleditschia or, in our 
plant-houses, by Cassias, Bauhinias, and occasionally some others; and 
the Mimosa tribe, to which belong the Sensitive-plant (Mimosa pudica), 
the Calliandras, and the numerous Australian Acacias of our plant- 
houses. The Leguminose thus form, after the Composites, the most 
extensive of all the Natural Orders of flowering plants. 
Leaves simple, or with 3 leaflets . : : X 2 ‘ ; Z or 9 
1 { Leaves pinnate, with 2, 4, or more leaflets . : . 12 
Calyx distinctly divided into two lips, either aes or the upper one 2. toothed 
of and the lower-one 3-toothed : 2 ‘ A : 
Calyx with 5 distinct teeth, not arranged i in two lips. 5 
8 { Calyx yellow, nearly as long as the petals, deeply divided into 0 two t ULex, 
Calyx short, not divided below the middle . ° ; 4 
hae of the calyx deeply toothed . é ; “ ¢ ; oo) GENISTA. 
Teeth of lips very short. : : ‘ 5 E ‘ . | . 3, CYTISUS. 
5 Keel of the corolla very pointed . : ; 3 ‘ , ‘ : - : 
Keel of the corolla obtuse : 4 
Leaves with 1 or 3 leaflets. Flowers solitary or in racemes. Stamens mona- 
delphous : . 4, ONONIS. 
6 Leaves linear, without leaflets Flowers solitary or in Yacemes. Stamens 
diadelphous . 17. LATHYRUS. 
Leaves with a pair of leaflets at the base of the stalk besides the three at the 
top. Flowers in umbels. Stamens diadelphous . : «, 9. Loris. 
7{ Shrubs or undershrubs. Stamens mopeceppous ; : : . 2. GENISTA. 
Herbs. Stamens diadelphous . 2 : H . : : cok: 
8 Leaves simple or reduced to a tendril . ‘ ; Pua eT . %&L7, LArtHyrvs. 
Leaves with 3 leaflets 
9 f Pod much curved or spirally twisted. Flowers i in short racemes 5. MzEprcago. 
Pod straight or nearly so i ‘ : : , A : 10 
10 f Flowers in long racemes } i : : : : O08) MELILOTUS. 
Flowers in heads or short racemes : : : : 11 
W f Pod several-seeded, much longer than the calyx : . . 7. TRIGONELLA. 
Pod 1- to 4-seeded, seldom exceeding the calyx . 5 : - 8, TRIFOLIUM. 
12 | Flowers in umbels or globular heads . : : ’ : ‘ : : orice 
Flowers in spikes or racemes, or solitary . AZ 
13 { Umbels with a leaf at the top of ihe bedunels immediately under the flowers 14 
Umbels leafless : ‘ : 16 
14 { Calyx inflated, enclosing the pod . : : : : : . 10. ANTHYLLIS. 
Calyx not inflated, shorter than the pod ..: Q : : 15 
15 f Leaflets 5. Keel pointed or beaked. Pod not jointed : : . 9. Lotus. 
°¢ Leaflets many. Keelobtuse. Podjointed. . . _. 13. OrNnITHOPUS. 
Keel very pointed . . : : : : : 14. HIPPOCREPIs. 
162 Keel small, obtuse. Flowers minute ; . 13. ORNITHOPUS. 
Common stalk of all the leaves ending in ‘a terminal leaflet. Show not 
17 sagittate 18 
Common stalk of the leaves, at least some of them, ending i in a tendril or fine 
point. Stipules sagitiate, or half-sagittate . : : 20 
18 f Ped short, flat, with one seed ‘ : ‘ “15. OnoBRYCHIS, 
Pod turgid, or elongated, with several seeds ‘ : : : 19 
19 f Keel with a short, distinct point . . : ‘ : : é 12. OxyrRoris. 
Keel obtuse, without any point . : k s ; é . 11, ASTRAGALUS. 
