100 THE BUCKTHORN FAMILY. 
The Sumachs of our shrubberies (species of Rhus) belong to the large 
family,of Terebinthacew, widely spread over the temperate and hotter 
regions of the globe, but unrepresented in Britain. They are usually 
shrubs or trees, with mostly compound leaves, small regular flowers, 
definite stamens, inserted under a perigynous disk, quite free from the 
ovary, and no albumen in the seed. 
XXV. PAPILIONACEA. THE PEAFLOWER TRIBE. 
(A Tribe of the Leguminous family, or Leguminose.) 
Herbs, shrubs, or trees; the leaves alternate (or, in a few 
exotic genera, opposite), usually furnished with stipules, simple 
or more frequently compound ; the leaflets either pinnately or. 
digitately arranged on their common stalk. Flowers in axillary 
or terminal racemes or spikes, rarely solitary. Sepals combined 
into a single calyx, more or less divided into 5 or fewer teeth 
or lobes. Corolla very irregular, consisting of 5 petals; the 
upper one, called the standard, is outside of all in the bud, and 
usually the broadest; the two lateral ones, called wings, are 
between the standard and the two lower ones, which are inside 
of all, and united more or less by their outer edge into a single 
one called the keel; the claws of all 5 petals remaining free. 
Stamens 10, the filaments in the British species either mona- 
delphous, all united in a sheath round the ovary, or dzadelphous, 
when the upper one is free and the other nine united in a 
_ sheath. Ovary single, l-celled, with 1, 2, or more ovules arranged 
along the inner or upper angle (the one next the standard) 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 
papilionaceous, comparing it, by a not very intelligible stretch of imagi- 
nation, to a butterfly. . The whole family comprises two other tribes or 
sub-orders, chiefly tropical or southern: the Cesalpinia tribe, repre- 
sented in our plantations by the Judas-tree (Cercis) and the Gledttschia, 
or, in our plant-houses, by Cassias, Bauhinias, and others; and the 
Mimosa tribe, to which belong the Sensitive-plant (Mimosa pudica), the 
Calliandras, and the numerous Australian Acacias. The Leguminose 
thus form, after the Composites, the most extensive of all the Natural 
Orders of flowering plants. 
{ Leaves simple, or with 3 leaflets. oe ap ne eee 
Leaves pinnate, with 2, 4, or more leaflets : 
ah ( Caalgeat distinctly divided into 2 lips, either entire, or the upper one 2- toothed | 
and the lower one 3-toothed . 
?) Gays with 5 distinct teeth, not arranged i in 2 lips ° 5 
3 Calyx yellow, nearly as long as the petals, dearly. divided into two 1. ULEX. 
* | Calyx short, not divided below the middle . : . 4 
a 2 
