378 



VARIOUS PLANT GROUPS 



times petals do not appear at all, hut when they do it is as 

 distinct projections from the torus, comparable to the first 

 rudiments of foliage leaves as they form near the tip of a 

 developing shoot. The same is true of sepals, stamens, and 

 carpels, as illustrated in Figs. 298, 299 I. If, however, a gam- 

 osepalous calyx, a monadelphous androecium, or a compound 

 pistil is to be produced, it happens sooner or later that those 



jft/AA jHi- 



Fiu. 298. — Flower of Rose {Rosa alpina, Rose Faniilj-, Rosacea) iu early 

 stages, cut vertically and enlarged. A, the sepals (A-) are well de- 

 veloped, but the petals (c) and the stamens (a) are just appearing as 

 minute knobs. B, sepals, petals, and stamens further advanced; and 

 the pistils (g) just appearing as knobs on the dome of the stem-tip. 

 C, later stage. D, still later stage in which the parts are still developing 

 in the bud. (Payer.) 



parts of the ring which connect the original projections begin 

 to grow and the distinct parts are carried up on the rim or the 

 tip of a tube or united mass of organs. 



Flowers which as they develop retain the original distinct- 

 ness of their petals, or which develop none at all, are termed 

 archichlaniydeous.^ Such flowers, we have seen, characterize 

 the crowfoot series which includes all the orders we have 

 studied and a number of others resembling them in the pe- 

 culiarity noted. 



130. The heath family (Ericaceae). Examples: wintergreen 



' .\r"ohi-clila-my(l'o-ou.s < Gr. archi, first; chlnmys, mantle; imply- 

 ing that the corolla, likened to a mantle, retains its original condition. 



