12 HEREDITY AS ILLUSTRATED BY TRICHOMES. 



TRICHOMES OF PAPAVER HYBRIDS AND THE PURE SPECIES. 



TRICHOMES OF THE PURE SPECIES. 



The thive speck's of l'a/>aw which were studied have only one type of 

 trie-home, which is niulticellular. awn-shaped, and usually slightly curved 

 (fit;'. 2). The trie-homes may attain a length so great as 7.0 mm. {Papaver 



). although they usually are shorter than this. 



FHJ. 2. Trichomes <if I'ttparrr pure lines and hybrids. l\timt:fr somniferum: a, multieellu- 

 lar trichome from youny; stein ( lln b, detail of tip of trio home, showing appressed dis- 

 tal ends of the superficial cells ( :',ii'J). l'ai>ai-er oritnlalr: r, tip of triohome, to show the 

 projection rdisi:il ends of snprrtlnlal (c'lls ( :ili2): </. detail from middle portion of tri- 



(home < W2} . / > nf>ar< i r ]>i/xinn: r, '2 triuhomes, s 

 projection of superficial cells { 84), Pajtarrr stun) 

 middle part of a typical trichome, losliow the Inooi 

 only a portion of which project ( .'W2); </, tip ol'tricl 

 /'. ftifoxitnt: It and /, Iricrhoinc^ from a leaf, illustrat 

 of superficial cells ( si). 



ini-diagrainniatic, to illustrate the 

 i/rritm I*, oricntafe: ./, detail from 

 sistent behavior of superficial cells, 

 oine ( ;t(i'2) . Palaver somniferutn 

 ng relatively prominent projections 



The trichomes have a curious structure, unlike any other encountered in 

 the course of this investigation, Their growth appears to be indetermin- 

 ate. As a direct result of this character the length of the trichomes is 

 very unequal, so that comparative study of them from this standpoint would 

 he without value. The trichomes end in a sin<>-le much-eloncrated cell 



