SERIES II. 



FLOWERLESS OR CRYPTOGAMOUS PLANTS. 1 



Those which fructify without true flowers ; that is, with- 

 out stamens and pistils, and produce spores (simple cells) 

 in place of seeds. 



CLASS III. ACROGENS. 



The highest class of Floweiiess Plants, those with a 

 distinct axis, or stem, growing from the apex, containing 

 woody matter and ducts, and bearing leaves, or something 

 answering to leaves. 



CXXXVII. EQUISETACEJ;, HORSETAIL FAMILY. 



Perennial plants, rising from creeping rootstocks; the stems 

 mostly hollow, furrowed, many-jointed, with mere scales at 

 the joints united into a sheath in place of leaves ; either 

 simple or with branches in whorls about the joints ; fructifica- 

 tion in terminal cone-like spikes, composed of 5-angled, short- 

 stalked, and shield-shaped scales, each bearing on the under 

 surface about 6 one-celled spore cases. Contains but one 

 genus, EQUISETUM, the HORSETAILS or SCOURING RUSHES, 

 in low places. For the species the student should consult the 

 Manual. (Lessons, Figs. 493-498.) 



CXXXVIII. FILICES, FERN FAMILY. 



Plants with creeping or ascending rootstocks, or even erect 

 trunks, bearing distinct leaves (fronds) on stalks (or stipes) 

 which are rolled up (circinate) in the bud, and bear commonly 



1 The account of the Flowerless Plants in the original edition was prepared by Professor 

 D. C. Eaton of Yale College. 



