36 



GLOSSARY OF 



(2) Coma, a tuft of hairs attached to the testa iu some 

 seetls, as in Willow-herb and Milk-weed (Fij?. 202). 



The coma must not be confounded with tlie pappus 

 of composite flowers ; the latter is attached to the fruit. 



(3) Wing, a thin expansion of the testa (Fig. 203). 

 But in the seeds of tlie Pine tlie wing splits off from the 

 scale upon which the seed grows (Fig. 168). 



Nucleus : the body of tho spod within the integument, con- 

 taining 



(a) Embryo, the j'oung plantlet as found in the seed. 

 Tlxis is made up of 



(1) liadicle, the rudimentary stem (Fig. 204). 



(2) Cotyledons, or Seed-leaves, the first leaves, often 

 thick and fleshy, as in the Bean (Fig. 205), but some- 

 times thin and leaf-like. 



(3) Plumule, the bud at the top of the radicle (Fig. 

 204). 



(b) Albumen or E ndosperm, when present : nourishing 

 matter stored up outside the embryo, as shown in tlie 

 ihaded portion of Fig. 206, the light part in the centre 

 being the embrj'o. 



Kind. 



DicoTYLEixj.sou.s: having two cotyledons (Figs. 207, 208, 209). 



MoNfx;OTVLEiX)NOiis : having onlj- one cotjiedon (Figs. 210, 

 211, 212). 



PoLVCfrrvLEixJNOUS : havuig several cotyledons (Fig. 206). 

 This is rare. 



Acf/rvLEDONOUS : having no cotyledons (rare). 

 AL.BU.MINOU8 : having albumen or endosperm in addition to 

 the embryo (Figs. 206, 210). 



The following terms apply to the folding of the parts of the 

 embryo in dicotyledonous seeds : 



(a) AcrumfM-nt, when the radicle is turned so as to 

 touch the edges of the cotyledons (Fig. 213). 



(b) Inmmhrnf. when the radicle is turned so as to lie 

 against the h>ack of one cotyledon (Fig. 214). 



(c) Condupl irate, tlie same as incumlifnt with the 

 addition that the cotyledons are curved so as to partly 

 infold the radicle (Fig. 215). 



Nature and Use of the Parts of the Flower. 



All the parts of the flower are leaf-forms (phyllomos). differing 

 from ordinary foliage-leaves. fMrau.se tin ir fuurfious are 

 diffrrmt. 



Fipr. 202. 



cotyledon 



9 



\ 



Fip. 203. 



Iihiniule 

 rudicle 



V\\i. 20 1. 



cotyledon 



Kiir. -.'05. 



-test:i 



-teg^en 



F\k. 206. 



Figs. 5!07. MH. 201t. 



FiK.no. 



Fljr. n.1. 



Fig. 211. Fig. 212. 



Fig. IW. 



Ffg. 21.5. 



