GLOSSOLOGY OF ANGI0SPEBM8. 435 



differing as to tlie relative lengtlis of ilie stamens aud styles ; these are 

 called heterogonous* or heterostyled. Wlien tliere are two forms, viz., 

 one in which the stamens are long and the styles short, and the other 

 with short stamens and long styles, the flowers are said to be diinurpli- 

 ous, or more accurately Juterogonous dimorphous, and the forms are 

 distinguished as sh' rt-styled and long-sty'ed When, as in some spe- 

 cies of Oxalis, there are three forms, viz., long-, mid-, and sliort-styled, 

 the term irimorphous (or better heterogonous tnmorphuu.^) is used. 



The Fruit. — The fruit may include (1) only the ripened ovary with its 

 contained seeds — eg., the bean ; or (3) these with an aduate calyx or re- 

 ceptacle — e.g. , the apple. Many changes frequently take place in ripen- 

 ing, sucli as (1) an increase in the number of cells by the formation of 

 false partitions, or (3) a decrease in their number by the obliteration of 

 some ; (3) the growth of wings or prickles upon the exterior of the ovary ; 

 (4) the thickening and formation of a so't and juicy pulp ; (5) the 

 hardening of some portions of the ovary wall by the development of 

 sclerenchyma ; (6) the thickening and growth of the calyx or recep- 

 tacle. 



In cases where in the ripening the ovary walls remain thin, and 

 eventually become dry, the fruits are said to be dry — e.g., in the bean ; 

 where the walls become thickened and more or less pulpy, they are 

 fieahy — !\q., the peach. These terms are also used in reference to the 

 fruit when it includes an adnate calyx or receptacle. In many fleshy 

 fruits (developed from carpels) the inner part of the pericarp wall is 

 hardened ; the two layers are then distinguished as exocarp and endo- 

 ciirp ; when there are three layers the middle one ia the memc.rp. 



The opening of the fruit in order to permit the escape of the seeds is 

 called its deliiscence, and such fruits are said to be dehiscent ; those 

 which do not open are indrhiirent. In fruits developed from single 

 carpels dehiscence is generally through the ventral or dorsal suture, or 

 both ; in those developed from compound pistils the partitions may 

 split, and thus resolve each fruit into its original carpels {septiddcU 

 dehiscence) ; or the dorsal sutures may become vertically ruptured, 

 thus opening every cell (loculus) by a vertical slit (loculicidal dthi - 

 ce-ce). Among the other forms of dehiscence only that called circum- 

 cissile and the t ' r. gular need be mentioned ; in the former a transverse 

 slit separates a lid or cap, exposing the seeds ; in the latter an irregu- 

 lar slit forms at a certain place, and through this the seeds escape. 



The principal fruits may be distinguished by the brief characters 

 given in the following table :f 



* Proposed by Dr. Gray, Am. Naturalist, Jan., 1877. 



f This is based upon Dr. Dickson's classification as modifipd by 

 Professor Balfour in the article " Botany " in the ninth edition of the 

 " Encyclopaedia Biitannica," Vol. IV., p. 153. 



