258 
THE STUDY OF THE SCIENCE OF BOTANY. 
is procured; nor Hepatica, with its modest beauties, be omitted. 
Orders five, viz. 
Monogynia ; Capparis spinosa. ' 
Digynia ; JBauera humilis. 
Trigynia ; Hibbertia dentata. 
Pentagynia ; Aquilegia vulgaris. 
Polygynia ; Liriodendron tulipifera, tulip tree. 
Classis XIV.— Didynamia. 
Didynamia , from dis, twice, dyo, 
two, and nema, a filament; mean- 
ins; that this class bears bisexual 
flowers, furnished with four stamina, 
two long and two short. (See Classis 
IV.) 
As the flowers of this class have a 
particular structure, there are general 
characters which will nearly serve for the whole, and these I shall 
give at length, for the further information of the young botanical 
researcher. 
1. Calyx ; a perianthium, monophyllous, erect, tuberose, quinquefid, 
with segments for the most part unequal and persisting. 
2. Corolla monopetalous and erect, the base of which contains the 
honey, and does the office of nectarium; the upper lip straight, the 
lower spreading and trifid; the middle segment the broadest. 
3. Stamina , four filaments subulate, inserted into the tube of the 
corolla, and inclined towards the back thereof; the two inner and 
nearest the shortest; all of them parallel, and rarely exceeding the 
length of the corolla. The anther a lodged under the upper lip of the 
corolla in pairs, in each of which respectively the two anthera approach 
each other. 
4. Pistillum. The germ commonly above the receptacle; the style 
single, filiform, bent in the same manner as the filaments, usually 
placed within them a little, exceeding them in length, and slightly 
curved towards the summit. Stigma emarginate. 
5. Pericarpium either wanting, as in the first, or, if present, bilo¬ 
cular, as in the second order. 
6. Seeds; if no pericarpium, four, lodged within the hollow of the 
calyx, as in a capsule; but, if there be a pericarpium, more numerous, 
and fastened to a receptacle placed in the middle of the pericarpium. 
