CLASS Xlll. ORDER I. 53 



CLASS XIII. DIDYNAMIA. 



ORDER I. GYMNOSPERMIA. 



A. Calyx b-cleft, loilh the divisions or teeth nearly equal. 



Teu'crium. Corolla deep-cleft on the upper side and without an upper lip, 

 »ower 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"rHA. 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"ciiys. Calyx with its divisions awned ; corolla with the upper lip vault- 

 ed, the lower lip 3-lobed ; the 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.) 



Verbe'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 

 Ihe 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.) 



PycNAN"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 

 tipper 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'pos. 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 segment largest ; anthers beardless, spreading ; stigma 

 2-cleft, shorter than the uj^er 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. 



