Observations on Pitchered Insectivorous 
Plants (Part II 1 ). 
BY 
J. M. MACFARLANE, D.Sc., F.R.S.E. 
With Plates XIX, XX, and XXI 
II. Histology of Darlingtonia, Sarracenia, and 
Heliamphora, with remarks on adaptations for 
INSECT-CATCHING. 
HE degree of histological differentiation exhibited by 
X the genera already treated of ( Nepenthes , Heliamphora > 
Sarracenia , and Darlingtonia) is worthy of note. Darlingtonia 
and Sarracenia exhibit practically an equal degree of com- 
plexity in their hairs and glandular structures, though on 
slightly different lines of formation. Heliamphora again is 
very nearly related to Sarracenia , but in hair-distribution 
and gland-structure exhibits an interesting approach to 
Nepenthes , the most highly specialized of all. But while the 
first three genera possess an elaborate arrangement of hairs 
for bewildering and catching animal prey, the last is entirely 
1 For Part I, see Ann. of Bot. Ill, p. 253. Since this paper was written, the 
second part of Professor Goebel’s Pflanzenbiologische Schilderungen has 
appeared. It has been considered advisable to leave the text unaltered, but foot- 
notes have been added where such seemed necessary. 
[Annals of Botany, Vol. VII. No. XXVIII. December, 1893.] 
