470 



LABIATJE. 



lobes of the lower lip ; anthers 2-celled, or 1 -celled by abortion, or 

 by absorption of the septum (fig. 333) ; connective sometimes large 

 and distractile (fig. 333 c). Disk fleshy. Ovary free, deeply 4-lobed 

 (figs. 402, 669) ; ovules 4 ; style 1, basilar (figs. 402, 671 s) ; stigma 

 bifid (fig. 671 s), usually acute. Fruit consisting of 1-4 achasnia, en- 

 closed within the persistent calyx (figs. 402, 672). Seeds erect (fig. 

 673); albumen either 0, or in small quantity; embryo erect (fig. 

 673 e) ; cotyledons flat ; radicle inferior. Herbs or undershrubs, with 

 tetragonal stems, opposite exstipulate leaves, and cymose inflorescence, 



b 



the flowers being often in verticillasters. Linnaeus looked upon the 

 fruit as naked seeds, and hence included many of the plants in the 



Figs. 669-673. Organs of fructification of Lamium album, to illustrate the natural order 

 Labiatse. 



consequence of one being undeveloped, and four divisions of the ovary. 



Fig. 670. Entire flower viewed laterally, c, Five-cleft calyx, t, Tube of the corolla. Is, Upper 

 lip of two petals. I i, Lower lip of three. s, Style. 



Fig. 671. The flower cut vertically, c, Calyx, p, Corolla, e, Didynamous stamens, s. Style 

 and bifid stigma, o, Ovary. 



Fig. 672. -Fruit (a tetrachaenium) cut vertically, showing the carpels, two of which have been 

 removed, c, Persistent calyx, g, Fleshy disk or gland, r, Gynobasic receptacle bearing the 

 style, s, which is basilar, i. e. arises from the lower part of the carpels, o, Two carpels which form 

 achsenia when ripe. 



Fig. 673. A carpel cut vertically, p, Pericarp, t, Integument of the seed e, Embryo erect 

 with inferior radicle. 



