SAXIFBAGACJEJE. 



361 



which it alternates and keeps them more or less in contact, and 

 bears an introrse two-celled anther of longitudinal dehiscence. 1 The 



Pittosporum revolution. 



Fig. 421. 

 Flower (f ). 



Fig. 422. 

 Diagram. 



Fig. 423. 

 Long. sect, of flower (^). 



Pittosporum Tobira. 



free ovary is formed of two nearly complete or incomplete cells, the 

 parietal placentas usually touching without cohering. More rarely 

 we find from three (fig. 424) to five cells. The indefinite ovules, 

 biseriate on each placenta, are anatropous, usually ascending. The 

 ovary bears a style, more or less 

 dilated at the apex into a head; this 

 may be subentire or divided into 

 as many indistinct lobes as there 

 are placentas. The fruit is a cap- 

 sule ; it opens lengthwise into two 

 or more rarely more concave valves, 

 on the middle of each of which 

 is a polyspermous placenta. The 

 seeds are usually surrounded by viscid juice, and contain a hard 

 or fleshy albumen, with a little embryo near its apex (fig. 425). 

 Pittosporum comprises some fifty species 2 of small trees and shrubs, 

 from the warm and temperate regions of Asia, Africa, and Oceania. 



Fig. 424. 

 Fruit opened. 



Fig. 425. 

 Seed, long. sect. (±). 



1 In P. undulatum the pollen consists of ovoid 

 grains with three folds. When moistened they 

 become spherical, with three papillate bands. 

 (H. Mohl., in Ann. So. Nat., ser. 2, iii. 338.) 



2 Hook., Icon., t. 621. — Hook. & Arn., in 

 Beech. Voy., Pot., t. 32. — Wight & Arn., 

 Prodr., i. 153.— Wight, Icon., t. 971; III, t. 

 70. — Putterl., Si/n. Pittosp., 5. — Vent., Jard. 

 Cels., t. 76.— Bonpl., Jard. Malm., t. 21. — 



Anpr., Pot. Pepos., t. 151, 383.— Sweet, Fl. 

 Austral., t. 25. — Hook, f., Fl. N.-Zel., t. 10 ; 

 Handb. N.-Zeal. FL, 18, 725.— A. Gray, Amer. 

 Fxpl. Exp., Pot., t. 17-19.— Ad. Br. & Gr., in 

 Ann. Sc. Nat., ser. 5, ii. 141 ; in Pull. Soc. Pot. 

 de Ft:, xi. 185.— Pot. Peg., t. 16, 186.— Pot. 

 Mag., t, 1396, 1684, 2075, 3161.— Wale., Rep., 

 i. 250; v. 71; Ann., i. 77 ; ii. 87; iv. 211; vii. 

 234. 



