96 THE GERANIUM FAMILY. 
chiefly in northern England and North Wales, extending neither into 
Scotland nor Ireland. Fl. summer till rather late. 
2. I. fulva, Nutt. (fig. 220). Orange B.—An annual closely resembling 
the last species, except that the flowers are of a deeper orange-colour, 
spotted with reddish-brown, and the spur is very closely bent back 
upon the calyx, and slightly notched at the extremity. 
A North American plant, fully established along the Wey in Surrey, 
and some other streams. Fl. summer. {J. biflora, Walt., is a much 
earlier name, ‘but it*has not been adopted by American botanists. ] 
The Rue (Ruta graveolens), and Fraxinellu (Dictamnus Fraxinella), both 
from southern Europe, belong to the very large family Rutacee, chiefly 
numerous within the tropics, and in the southern hemisphere, but 
unrepresented in Britain. The Diosmas, Correas, and many other South - 
African and Australian plants in our plant-houses, are members of the 
same family. 
XXIl. ACERACEA.. THE MAPLE TRIBE. 
(A Tribe of Sapindacee, or the Sapindus family.) 
The Maple tribe corresponds to the Linnean genus Acer, 
which modern botanists have broken up into two or three by 
the separation of a few North American or Kast Indian species. 
The whole group consists, however, but of very few species, 
ranging over the temperate zone of the northern hemisphere. 
The true Sapindacee are mostly tropical trees or lofty climbers, and 
are seldom to be met with even in our hothouses ; but the Horsechestnuts 
(4sculus, Linn.), form a distinct tribe of the same family, or, according 
to some botanists, the small adjoining family of Hippocastanew, which, 
like Aceracee, contains a small number of trees or shrubs from the 
northern hemisphere. The Bladder-nut of our shrubberies (Staphylea 
pinnata, Linn.), from central and eastern Europe, is the type of the third 
tribe or Sapindacee, in which, as in Aceraceew and Hippocastaneew, the 
leaves are always opposite, whilst in the true Sapindacee they are gene- 
rally alternate. 
I. ACER. MAPLE, 
Trees, with opposite, palmately-veined and lobed leaves, no stipules, 
and small greenish flowers, in axillary corymbs or racemes. Sepals 
usually 5, overlapping each other in the bud, and more or less united at 
the base. Petals 5, or sometimes 4, or entirely wanting. Stamens 
about 8, inserted on a thick disk below the ovary. Ovary 2-lobed or 
rarely 3-lobed, each lobe enclosing one cell with 2 ovules suspended 
from the inner angle. Styles 2, rarely 3, often united at the base. 
Fruit separating when ripe into 2, rarely 3, indehiscent carpels or nuts, 
produced into a wing at the top, and called keys or samaras, Seeds 1 
or 2 in each carpel, without albumen. 
A genus not numerous in species, but extending over Europe, Russian 
and central Asia, the Himalaya, and North America. It differs from all 
British trees, except the Ash, by its opposite leaves, and from that. rer 
by the flowers, and by the palmate not pinnate leaves. 
