VIII. THE FLOWER 



HYPOGYNOUS MONOCOTYLEDONS 



Material. — Any flower of the lily family with disunited petals. 

 Star-of-Bethlehem and yucca are used in the text. Tulip, trillium, dog- 

 tooth violet {Eryihroniimi), spiderwort {Tradescantid), white lily, all 

 make excellent examples. 



282. The Floral Envelopes. — Make a sketch of a flower 

 of the Star-of-Bethlehem, or other of the Hly tribe, from 

 the outside. Label the head of the peduncle that sup- 

 ports the flower, receptacle, or torus, the three outer 

 greenish leaves, sepals, the three inner, lighter colored 

 ones, petals. The sepals taken together form the calyx. 



Stlg 



368 369 370 



368-370. — Flower of a hypogynous monocotyledon dissected : 368, a flower of 

 the Star-of-Bethlehem, showing the different sets of organs : pet, petals ; sep, sepals ; 

 sta, stamens ; plst, pistil ; ped, peduncle ; 369, side view of star-of-Bethlehem with all 

 the petals and sepals but two removed to show order of the parts : ? , receptacle ; 

 0, ovary ; sty, style ; stig, stigma — parts composing the pistil ; f, filament ; a, anther 

 — parts composing the stamen ; 370, cross section of the cvaiy of star-of-Bethlehem ; 

 c, c, carpels ; ov, ovules ; pi, placenta. 



and the petals, the corolla. In many flowers, such as the 

 tuHp and Atamasco lily {Zephyranthes\ there is little or no 

 difference between them. In such cases the calyx and 

 corolla together are called the perianth, but the distinc- 

 tion of parts is always observed, the three outer divisions 



196 



