CLASS XIII. ORDER I, 
53 
CLASS XIII. DIDYNAMIA. 
ORDER I. GYMNOSPERMIA. 
A. Calyx b-cleft, with the divisions or teeth nearly equal. 
Teu'crium. Corolla deep-cleft on the upper side and without an upper lip, 
iower lip 3-cleft, the middle division rounded ; stamens and pistils incurved ; 
stamens exsert through the cleavage on the upper side of the corolla, (wood- 
sage, wild germander.) 
Men"tiia. Corolla nearly equal, 4-lobed ; broadest division emarginate; sta- 
mens erect, distant, (spearmint, peppermint.) 
Isan"thus. Calyx somewhat bell-form ; corolla 5-parted; tube straight, nar 
row; divisions ovate, equal ; stamens nearly equal ; stigma linear, recurved, 
(blue gentian.) 
Hedeo'ma. Calyx 2-lipped, gibbous at the base; upper lip with 3 lanceolate 
teeth; lower lip with 2 subulate ones; corolla ringent; 2 short stamens barren, 
(pennyroyal.) 
Cuni'la. Calyx cylindrical, 10 striate, 5-toothed ; corolla ringent, with the 
upper lip erect, flat, and emarginate ; 2 barren stamens, the 2 fertile ones with 
the style exserted ; stigmas divided, (dittany.) On account of their barren 
stamens, this and the preceding genus have been classed under Diandria. 
Nepe'ta. Calyx dry, striate; corolla with a longish tube; under lip with the 
middle division crenate; throat with a reflexed margin ; stamens approximate, 
(catmint.) 
La'mium. Upper lip of the corolla vaulted, entire; lower lip 2-lobed, toothed 
on each side. 
Sta'^chys. Calyx with its divisions awned ; corolla with the upper lip vault- 
ed, the lower lip 3-lobed ; I he middle division largest, emarginate; the lateral 
divisions reflexed ; stamens reflexed towards the sides after discharging the 
pollen, (wound-wort, hedge-nettle.) 
Leonu'rus. Calyx 5-angled, 5-toothed ; corolla with the upper lip erect, vil- 
lose, flat, entire ; lower lip 3-parted ; middle division undivided; lobes of .the 
anthers parallel, having shining dots, (mother-wort.) 
Yerbe'na. Calyx with one of the teeth truncate; corolla funnel-form, with a 
curved tube ; border 5-cleft, nearly equal ; seeds 2 or 4, with an extra vanish- 
ing tegument ; sometimes 2 stamens are barren, (vervain.) 
Marru'bium. Calyx salver-form, rigid, marked with 10 lines ; corolla with 
the upper lip cleft, linear, straight, (horehound.) 
Glecho'ma. Calyx 5-cleft ; corolla double the length of the calyx; upper lip 
2- cleft; lower lip 3-cleft, with middle segment emarginate; each pair of anthers 
approaching so as to exhibit the form of a cross, (ground-ivy, gill-overground.) 
PyGNAN'''THEMUM. Involucrum bract-like, many-leaved, under small heads of 
flowers; calyx tubular, striate ; corolla with the upper lip sub-entire; lower lip 
3- cleft; middle segment longer; stamens distant, nearly equal; cells of the 
anthers parallel, (mountain mint.) 
Aju'ga. Upper lip of corolla very small, 2-toothed ; stamens longer than the 
upper lip; anthers reniform. S. 
Ballo'ta. Calyx 5-toothed, salver-form, 10 striate ; upper lip of the corolla 
crenate, concave ; seed ovate, 3-sided, (false mother-wort.) Ex. 
Hysso'pu.s. Lower lip of the corolla 3-petalled ; middle lobe sub-crcnate ; sta- 
mens straight and distant, (hyssop.) 
Galeop'^sis. Calyx 5-cleft, awned ; upper lip of the corolla vaulted, sub-cre- 
nate ; lower lip with 3 unequal lobes, having 2 teeth on its upper side, (flow- 
ering nettle.) 
,Hyp''Tis. Calyx 5-toothed ; corolla 2-lipped, the upper one 2-lobed, lower one 
3-lobed, with the middle lobe calyx-like ; stamens inserted in the large part of 
the tube and declined. S. 
Leu'cas. Calyx tubular, striate, 6 to 10-toothed ; upper lip entire, lower lip 
long, 3-lobed ; middle segnpent largest ; anthers beardless, spreading ; stigma 
2-cleft, shorter than the upper lip. S. 
Synan'^dra. Calyx 4-cleft ; segments unequal, subulate, inclined; upper lip 
of the corolla entire, vaulted, lower lip with 3 unequal lobes; throat inflated,- 
naked ; filaments downy. S. 
Lavandu'la. Calyx ovate, sub-dentate; bracted ; corolla resupinate ; stamens 
in the tube, (lavender.) Ex, 
