PHANEROGAMIA 



659 



guished from the following family by the terminal position of the style (Fig. 



733 A). Only Verbena officinalis occurs in Britain. 



Lantana is a widely spread weed in the tropics. 



Tectona gratidis ( 49 ), a deciduous tree of the dry 



regions of the East Indies, yields the important 



timber TEAK. Avicennia ( 80 ), trees of the mangrove 



vegetation, with viviparous fruits and pneumato- 



phores (Fig. 213). Clerodendron ( 51 ) includes some 



myrmecophilous species. 



Family 6. Labiatae. Herbs or shrubs 

 with quadrangular stems and decussate 

 leaves without stipules. Leaves simple ; 

 plants often aromatic owing to the presence 

 of glandular hairs. Flowers solitary in the 

 axils of the leaves, or forming apparent 

 whorls. The small inflorescences are di- 

 chasia or double cincinni, and are often 

 united in larger, spike- or capitulum-like 

 inflorescences. Flower zygomorphic (Fig. 

 734). Calyx, gamosepalous, with five teeth; 

 corolla two-lipped, the upper lip consisting 

 of two, the lower of three petals ; stamens 

 in two pairs, two long and two short, rarely 

 only two. Ovary of two carpels, each of 

 which is deeply indented in the plane of 

 the false septum. Style springing from 

 between the lobes ; stigma bifid. A ring- 

 shaped nectary situated at the base of the 

 ovary. Fruit, a schizocarp, consisting of 

 four nutlets. 



IMPORTANT GENERA. 

 The Labiatae include a 

 considerable proportion 

 of our commonest native 

 spring and summer 

 flowers ; Lamium, Gale- 

 opsis, and Stachys have 

 the upper lip helmet- 

 shaped, Ajuga has it very 

 short, while in Teucrium 

 the upper lip is deeply 

 divided. Nepeta and 

 Glechoma differ from the 

 majority of the order, 

 in having the posterior 

 stamens longer than *'"' " 3li - s "' officinalis. Flowering shoot (J nat. size). Tubular 

 those of the anterior pair. " is " lay l "" 8tameBa (eillar ed >- 



Salvia, Sage (), is a genus containing numerous species ; the flowers are protaudrous 



*f 



