548 



BOTANY 



Order 7. Gynandrae 



Family Orehidaceae. Perennial, herbaceous plants growing as 

 epiphytes or in the ground, with hermaphrodite, zygomorphic flowers. 



Perianth petaloid, the pos- 

 terior segment of the inner 

 whorl developed as a lip or 

 labellum, which frequently 

 bears a spur. (The " label- 

 lum " of the Scitamineae 

 being formed of two stam- 

 inodes, is entirely different 

 morphologically.) Androe- 

 cium formed of the three 

 anterior stamens only ; the 

 middle stamen, belonging to 

 the outer whorl, is fertile ; 



FIG. 549. Flower of Cunnu iridifloru. //Ovary ; 

 k, calyx ; c, corolla I, labellum ; stj-s, the 

 other staminodiu ; a, fertile stamen g style. 

 (J nat size.) 



Flo. 550. Orchidaeeae. Floral 

 diagram (0/r/u.--). 



the other two are represented by staminodes. Cypripediwn has 

 these two lateral stamens of the inner whorl fertile. Gynaeceum 



FK;. 551. Orchis inHltitriK. Longitudinal 

 section passing through the old and 

 new tubers. (After LCEHSSEN.) 



Fl<;. 552. Koot-.syste.ni of Urchin latif<>li. 1,, 

 Base of stem ; s, cataphyllnry leaf; ', old, 

 I", young tubers ; /, . bud ; r, 1 roots. 



formed of three carpels, syncarpous ; ovary inferior, unilocular. 

 Fruit, a capsule. Seeds extremely numerous, borne on parietal 



