XX 
BOTANICAL TERMS AND DEFINITIONS. 
BiLOBUM, two-lobed. 
BiLOCULAR, two-celled. 
BiNA, applied to the situation of leaves, signifies only two upon a 
stem or plant. 
Bin ATE, {Binatum) a fingered l^af of two leaflets, inserted at the 
same point, precisely on the summit of the petiole. 
BiPiNNATE, {Bipinnatum) doubly pinnate, applied to a compound 
leaf, having a common petiole, which produces two partial 
ones, upon which is inserted the leaflets. 
BiTERNATE, (Biternatum) applied to compound leaves when the 
common petiole divides into two, each of which bears three 
leaflets. 
Blistering, {Bullatum) applied to leaves, when the upper surface 
rises above the veins, giving the appearance of little swell- 
ing irregularities over the surface, the under side having 
corresponding little cavities. 
Blunt, {Obtusum) terminating in a segment of a circle. 
Brachiate, (Brachiatus) four-ranked; applied to stems, when 
they divide and spread in four directions, crossing each other. 
Bractea, the floral leaf; small leafy appendages to the flower or 
its stalk, diflfering from the other leaves of the plant in 
form or colour. 
Bracteated, (Bracteatus) applied to peduncles, to flowers, and 
to cyme having bractea. 
Buds, (Gemmee) small conoid bodies, covered with scales, formed 
during summer on the branches of trees, containing the 
rudiments of a future plant, or part of a plant ; some buds 
produce flowers and leaves, others leaves only, and some 
flowers only. 
Bulbous Roots, {Radix Bulbosa) so called, are conical or globular 
roots, in substance tender and succulent, either solid, 
tunicate, composed of concentric layers j or scaly, consisting 
of fleshy scales ; connected only at the base, from which 
issue small fibres, and the fibres constitute the true roots.* 
Bunch, {Thyrsus) applied to flowers growing in a dense or close 
panicle, having more or less of a conical or ovate figure, 
(as the lilac, &c.) 
* Sir J. Smith says, " the two latter kinds, (i. e. the tunicate and scalyjhave the 
" closest analogy Avith leaf buds ; they are the reservoirs of the vital powers of the 
"plant, during the season when those powers are torpid or latent; and in order to 
" perform the functions of roots, they first produce fibres, which are the actual roots." 
