OEOHIDACE^. 



603 



inferior, 1-celled (fig. 850), composed of 6 carpels, of which 3 only- 

 are placentiferous (Lindley); style incorporated with the column 



Fig. 861. 



Pig. 852. 



Fig. 854. Fig. S53. 



Pigs. 845-851. Flower of Spiranthes autumnalis, to iUustrate the natural order Orohida- 

 oese. Pig. 845. ■ Flower after the ovary has twisted on itself, seen laterally, o, Ovary 

 with the adherent perianth, ce. Outer divisions of the perianth, called by some calyx, and 

 by Lindley corolla, ei. Inner divisions of the perianth, called by some the corolla, and 

 considered by Lindley as petaloid stamens. I, The labellum or lip, being the lower of the 

 three inner segments. Fig. 846. Diagram of the flower in the young state, before the- 

 twisting of the ovary has talcen place, a, The axis of the spike of flowers, pe, pe, pe, 

 Outer perianth, pi, pi, Two divisions of the inner perianth. I, Third division of the inner- 

 perianth, in this state placed next the axis, e, Fertile anther, s s, Two abortive anthers- 

 or staminodia. o. Ovary. Fig. 847. Summit of the flower cut vertically, o. Inferior 

 ovary with parietal ovules, g. I, Labellum or lip. s. Stigma, a, anther. Fig. 848. 

 Anther separated. Its inner surface shown with its two cells. Pig. 849. Granular pol- 

 len-masses taken from the anther. Pig. 850. Horizontal section of the ovary, with three 

 parietal placentas bearing numerous oviiles. Pig. 851. A seed sepai'ated, with its exter- 

 nal reticulated integument, t. Fig. 852. Embryo of Aceras anthropophora deprived of 

 its integuments. Fig. 853. Pollen-masses (Pollinia) of Orchis maculata, with the grains- 

 united in little conical masses, c, Caudicle terminated by the retinaculum and glands. 

 Fig. 854. The conical masses which the pollen-grains form by their cohesion. 



