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MORPHOLOGY OF THE ANGIOSPERMS 



The vascular supply of the seed coats is built up, as the seed en- 

 larges, from the supply of the integument or, where the integuments 

 have no vascular bundles, by extension from the bundles of the funicle. 

 In delicate seed coats, the new tissues may form a prominent feature of 

 seed structure. In the Capparidaceae and Thymeleaceae, a layer of 



Fig. 138. Structure of seeds and a fruit E; A, B, C, E, longitudinal sections; D, 

 cross section. Embryo well-developed in A, D; embryo in early stages in B, C, E. 

 A, Acalypha indica; B, Monotropa Hypopitys; C, Orohanche; D, Oenothera biennis; 

 E, Peperomia pellucida. ca, caruncle; ax, axis; hr, bract; cot, cotyledon; cp, carpel 

 (pericarp); en, endosperm; em, embryo; hy, hypostace; i, integument; ii, inner 

 integument; m, micropyle; nu, nucellus; oi, outer integument; pm, perisperm. (A, 

 ajter Johri and Kapil; B, C, after Koch; D, after Kayser; E, after Johnson. ) 



