584 LEGUMINOSÆ INDIGENOUS TO 
The calyx has its five teeth or divisions sometimes nearly equal 
and regular, more frequently the two upper are rather shorter and 
broader, and the lower one longer than the two lateral ones, and - 
these are never combined with the lower one into an under lip, as 
in Cytisus, Genista, Argyrolobium, &c., nor yet arranged with the 
upper ones into lateral pairs, as in Lotononis, some Crotalaria, 
&c., the lowest is in a few species much enlarged, and foliaceous. 
The petals vary in proportion, the standard usually supported on 
a short or very short claw is bent back immediately above that 
claw, keeled on the back, and never laterally reflexed ; callosities 
or tufts of hair are often found on the inside near the claw, but 
are very different in different species, and in many are wholly 
wanting. The wings are narrow, on longer claws than the 
standard, with the transverse folds less apparent than in other 
Genisteæ, they are either free or (in the Synpetale) cohere by their 
claws to the keel and staminal tube, or to the keel only (in some 
Leptanthe) just above the claw, without, however, the intervention 
of any appendage either inside the wing, as in Ononis, or outside 
the keel, as in Indigofera. The keel is rarely straight, often much 
arched or lengthened into a semicircular beak ; its two petals, 
borne on still longer claws than the wings, are connected along 
the back nearly from the claws to the apex. The staminal tube is 
always open on the upper edge. The ovary sessile or rarely 
stalked, laterally compressed, the outer or carinal edge nearly 
straight, the axile or upper edge convex or angular near the base, 
the upper end more or less tapering. The ovules are generally 
two, four, six, or eight, and these numbers tolerably constant in 
each species, or if an odd one is added it is accidental, and the 
odd ovule often small and imperfect. In one species only (A. vul- 
nerans) have I seensthree ovules in all the flowers I have examined, 
and in two species (A. filicaulis and macrocarpa), they are very 
numerous (from twenty to thirty). The insertion of the ovules 
is variable, sometimes they are opposite, or nearly so, in pairs, 
sometimes alternate and equidistant,* crowded together near the 
* That is to say, according to the phraseology of some wiiters; biseriate, or uni- 
seriate, although in fact in all Leguminosae, where there are more ovules than one, 
