\ 



irSSO'^T .^I.T now TO STUDY PLVNT.S. 191 



cotyledons (;is in Fi;j^. 2n), rojulily inspected if we have seeds, — 

 phovv it belongs to Class I. Its pistil refers it of eourse to Subclass I. 

 The corolla being a short funnel-shaped tube, tlieoretieally regarded 

 as formed of five pet^ils uniled up to lJ»e very summit or border, ren- 

 ders tiie flower a good illusiralion of tlie MoNoi*r,TALoi;s Division, 

 the analysis of which begins on p, 20, in the work we are using. 



o54. The calyx free from thc^ ovary excludes it from the section 

 A, and refers it to section B. This is subdivided, in the first place, 

 by the number of the stamens, and theii- position as respects the 

 lobes of the c<irolla. Now, as the petals of the corolla in this flower 

 are united up to the very bonier, the student may at first be puzzled 

 to tell how many lobes it should have, or, in other w<)r(l<, how many 

 petals enter into its conipo-ition. But the five leaves of the calvx 

 ■would lead ont; to expect a i-omlia of five pai-ts al«o. And, althongli 

 tlwre are here i-eally no lobes or notclics to be seen, yet the five 

 plaits of the corolla answer to the notches, and sliow it to consist of 

 fiv(! petals perfectly united. Since the stamens are of the same 

 number as the ])laits of the corolla, and are j)laced before them (as 

 may be best seen by sjdilting down the corolla on one side and 

 spreading it out flat), it follows that they alternate with the lobes or 

 petals; therefore our j)lant falls under the third sulxlivision : "Sta- 

 mens as many as the lobes or parts of the corolla and alternate with 

 them." This subdivides by the pistils. Our plant, having a i)istil 

 with two stigmas and two ceils to the ovary, must be referred to the 

 fifth and last category : " Pistil one, with a single c(mipound ovary," 

 &c. "We are then directed to the stamens, which here are "plaiidy 

 borne on the corolla " ; next to the leaves, which are on tht; stem 

 (not all at the i-oot), also alternate, without stipules; the stamens 

 .0, and the ovary 2-ceIIe(l, — all of which accords with the seventh 

 of the succeeding propositions, and with no other. The middle one 

 alone under this agrees as to the ovary and seed-, and all is confirmed 

 by the twining stem. It is the Conv(»lvl'm:s Family, p. 2G2. 



5.">"). The proper Convolvulus Family has green foliage, as has 

 our plant. Its style is single and entire, as in § 1. Its calyx has a 

 pair of lai-g(^ h-afy bracts, as in the sulxlivision with two stars. So 

 we reach the genus Calystkc.ia, or Bijactkd Bixdwi'.i.o. 



556. Under tlii-^ cenu> two species are deserilx'd : the twining sti'tn. 

 and the other particulars <ifonr plant, direct us to the first C. si.niM, 

 which in England is nameil llr.ixiK Bindwi'.kd. and here is one 

 of the various Conv olvulaccoii- plants known a- >h)UM.N<;-( Ji.oitv. 



