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AN ENCYCLOPÆDIA 
OF HORTICULTURE. 205 
Botrychium— continued. | 
sterile segments 2in. to 4in. Jong, the latter 3in. to 6in. each way, 
deltoid, tri- or a grea lower pinnz much the largest. 
Jertile peduncle 6in, to 9in, long ; panicle lin. to 6in. long; deltoid, 
yery compound. Nootka and Hudson’s Bay territory. Several 
so-called species come very close to this, including 
australe, lunarioides, and obliquum, which are only 
geographical varieties. Greenhouse species. 
B. virginianum (Virgipian).* - sti. 3in. to 18in. long. 
sterile segments sessile, țin. to 12in. each way, deltoid, 
quadripinnatifid; lower pinnæ much the largest; pin- 
nules oval-oblong, close, cut down to the rachis into 
finely cut linear-oblong segments. fertile peduncle equal- 
ling or exceeding the sterile part of the plant when 
mature; panicle lin. to 4in. long, loose, oblong. Oregon, 
and North United States, 1790. A hardy species in shel- 
tered places. (H: G. F. 29.) 
BOTTLE-GOURD. See Lagenaria. 
BOTTLE-TREE. See Sterculia rupestris. 
BOTTOM HEAT. This is usually secured by ` 
passing hot-water pipes through an air chamber, or 
a water tank, beneath a bed of plunging material. 
The covering of the tank or chamber is best made 
of slate. The heat must be regulated according to 
the requirements of the subjects grown; this is 
easily accomplished by using the valve. A ther- 
mometer should be placed in the tank or bed. 
Bottom-heat is indispensable for propagating plants 
from seeds and cuttings, especially in spring. See 
Heating and Hotbeds. 
BOUCEROSIA (from bowkeros, furnished with 
buffaloes’ horns; in reference to the curved lobes 
. of the corona). ORD. As- 
clepiadacee. A genus of 
greenhouse succulent pe- 
. rennials, allied to Stapelia, 
‘A andrequiring the same cul- 
Flowers numerous, 
terminal, umbellate; co- 
rolla sub-campannulate, five-cleft; 
segments broadly triangular, with 
acute recesses; stramineous co- 
rona fifteen-lobed ; lobes disposed 
in a double series; the five inner 
ones opposite the stamens and 
lying upon the anthers; the rest 
exterior, erect, or a little incurved 
at apex, adhering to the back of 
the inner ones. Branches and 
stems tetragonal, with toothed 
angles. 
g temin non canoe ty i pa to 
Sicily, 1833. SYNS. Apteranthes and 
Stapelia Gussoniana. See Fig. 268. 
(B. R. 1731.) 
meet 
Fic. 268. BOUCEROSIA 
EUROPA. orocco).* fl. dark 
maroccana 
red purple, with yellow concentric 
lines. Summer. l. minute, trowel-shaped, deflexed at tip of 
stem angles. A. 4in. Morocco, 1875. (B. M. 6137.) 
BOUCHEA (named after C. and P. Bouche, German 
naturalists). ORD. Verbenacee. A small genus of stove or 
greenhouse evergreen herbs or sub-shrubs. Flowers sub- 
sessile, in spicate racemes, which are either terminal or in 
the forking of two branches; corolla funnel-shaped. Leaves 
Opposite, toothed. They thrive in a well-drained compost 
of loam and sandy peat. Propagated by cuttings, placed 
. oe under a glass, and in a gentle heat, during spring. 
eif - . ite. pril. h. 4ft. 
Cape of gee eat So y P sua T maeh shrub. 
SYN. Chascanum cuneifolium. ae 
B. udogervas i ; : 
spike z ka emt in. te io ae slender,” September, 1 opposite, 
ell, 1c-O P Í 
© A Rit to Sft. "Brazil, 1814, A stove perennial. (B. M. 
(named after De Bougainville, a 
French navigator). ORD. Nyctaginee. Gorgeous warm 
greenhouse or conservatory plants, comprising some of the 
most showy climbers in cultivation. Their beauty lies in 
onous, 
ERT So ers 
Bougainvillea—continued. 
` the’ bracts, which envelop the small greenish flowers. 
B. glabra may be grown in pots, or planted out in the 
greenhouse borders; the others are best planted out, as 
AN 
Fig. 269. FLOWERING BRANCH OF DOUGAINVILLEA SPECTABILIS. 
they root very freely, and plenty of space would be occu- 
pied if allowed, but it is best to limit it, as they bloom 
much better. Strict training and pinching are not de- 
sirable, being prejudicial to the free production of bloom ; 
indeed, the best plan is to allow the plants to ramble freely 
over the roof of a moderately high house, or along the upper 
portion of a back wall; they will then bloom profusely for 
several months in the year, provided proper attention be 
paid to watering, and that the plants are in a well-drained 
situation. In preparing a border for their reception, the 
first point to be considered is the drainage, which must be 
perfect. This is best effected by placing a layer of brick 
rubbish, 6in. to 9in. in thickness, communicating with the 
drain, by which means all sourness and stagnancy of the 
soil will be obviated. The bed should be excavated to a 
depth of 18in. or 2ft. Three parts turfy loam, and one 
part leaf soil, with the admixture of a liberal quantity 
of sharp gritty sand, will form a suitable compost for the 
culture of Bougainvilleas. The amount of sand invorpo- 
rated must depend upon the quality of the other com- 
ponents, heavy loam requiring more than that which is more 
friable. The occasional incorporation of manure in the 
compost is not to be recommended; but a liberal applica- 
tion of liquid ‘manure will be of material advantage, espe- 
cially if the root space is limited. When the plants cease 
blooming each year—about November or Decemb 
they should be dried off and rested; and in February 
they should be closely spurred in, the same as with vines, 
and all weak leaders removed, so that strong wood only is 
left. When grown in pots, they must be started in brisk 
heat. They are easily increased by cuttings prepared 
from the half-ripened wood; these should be placed in 
sandy soil, in a brisk bottom heat, when they will soon. 
root. Scale, red spider, and mealy bug are the only insects 
likely to infest the plants, and recipes for their destruction 
will be found Se aes a4 ae 
smooth).* Ji., inflorescence panicled, er 
or B, pb each princhlet producing cordate-ovate acute rosy 
