562 



PART IV. CLASSIFICATION. 



SUB-CLASS II. GAMOPETAL^E. 



Flowers usually monoclinous : perianth differentiated into calyx 

 and corolla : calyx usually gamosepalous ; corolla generally gamo- 

 petalous, in some cases suppressed : ovary usually syncarpous. 



SERIES I. HYPOGYKE. 



Ovary superior (except in Vacciniacese; : stamens epipetalous, or 

 free and hypogynous. 



Cohort I. Lamiales. Flower pentamerous, usually dorsiven- 

 tral : the formula is generally -f K (5) [C (5) A 5] G ; corolla 

 usually bilabiate, the two posterior petals being connate and form- 

 ing a frequently helmet-shaped (galeate) projecting upper lip ; the 

 anterior petal, with the two lateral petals, forming the under lip : 

 stamens epipetalous ; 

 the posterior stamen 

 is usually suppressed 

 or is a staminode ; the 

 two lateral stamens 



are generally shorter m \jj* < x \ \ I Ij / /-] 



than the two anterior */* ,\\A\\\ \\ V / ^~7l 



ones, so that they are ^ 



didynamous : the two 



median carpels form a 



usually bilocular 



ovary which some- 



times becomes sub- 

 divided into four lo- 



FIB. 376. A Flower of Lamium, side view : fc calyx ; o 

 upper ; 11 under lip. B Flower of Leonurus opened : o 

 upper ; M divided under lip ; s lateral lobes of the 

 Culi : leaves Scattered, corolla; // short, /'/long stamens (mag.). C Gynsu- 



or opposite decussate ceum ; " Wobed ovary : g style taa *' ) - 

 exstipulate : the leafy shoots have no terminal flower. 



Order 1. LABIATE. Stamens four, didynamous (Fig. 376 B) ; 

 rarely, as in Salvia and its allies, only the two anterior stamens 

 stamens are developed : the bicarpellary ovary becomes subdivided 

 by spurious dissepiments into four loculi (Fig. 376 (7), which part, 

 as the seed ripens, into four nutlets (as also in the Boraginacese, 

 see Fig. 383) ; style gynobasic : the ovule in each loculus is solitary 

 and erect : seed without endosperm. Herbs with decussate leaves 

 and quadrangular stem. The flowers are disposed apparently in 

 whorls round the stem, but the inflorescence is in fact made up of 



