456 



EXOGENOUS OR DICOTYLEDONOUS PLANTS. 



pairs to five glands of the stigma, and removed from the anther- 

 cells usually by the agency of insects. Fruit consisting of two 

 follicles. Seeds usually with a silky coma. Ex. Asclepias (Milk- 

 weed, Wild Cotton). The juice of A. tuberosa (Pleurisy-root, 

 Butterfly- weed) is not milky. In all, it is bitter and acrid, and 

 contains caoutchouc. 



964 962 



855. Ord, Jasminaceae (the Jessamine Family) consists of a few 



FIG. 955. Flower-bud of the common Milkweed (Asclepias Cornuti). 956. Expanded flower; 

 the calyx and corolla reflexed ; showing the stamineal crown. 957. One of the hooded appen- 

 dages of the latter removed and seen sidewise, with its included process or horn. 958. A verti- 

 cal section of a flower (the hooded appendages removed) through the tube of stamens, the thick 

 stigma, ovaries, &c. 959. Flower with the calyx, and the fertilized enlarging ovaries, crowned 

 with the large stigma common to the two, from the angles of the peltate summit of which the 

 pairs of pollen-masses, detached from the anther cells, hang by their stalks or caudicle from a 

 gland. [See page 315 : Fig. 420. An anther, from which the hooded appendage is cut away. 

 421. One more magnified: its two pollen-masses still in the open cells, but attached by their 

 stalks each to one of the glands, to which a pollen-mass of an adjacent stamen on each side is 

 already similarly attached. 422. One of these pairs of pollen- masses separate. 423. Pollen- 

 masses of Asclepias incarnata, connected by their emitted pollen-tubes (much magnified) with 

 the stigma. 424. Section through the stigma and into one of the styles, showing the course of 

 the pollen-tubes.] 960. Fruit (follicle) of the Common Milkweed. 961. Cross-section of the 

 last, in an early state. 962. Detached placenta in fruit, covered with seeds. 963. Seed (cut 

 across), with its coma. 964. Section of the seed as it lies in 963, parallel with the cotyledons. 

 965. Vertical section of the seed perpendicular to the face of the cotyledons. 



