BOTANY OF "LA SAT7L,E COUNTY. 41 



Co.; Prof. Henry Boltwood, trow of Evairston, des- 

 ignated foy a B.; Mr. Charles P. Johnson, formerly of 

 Marseilles, now of Freeport, indicated by Jh.; and 

 ourself. In a few cases the statements of parties 

 familiar with the subject are referred to. In all other 

 cases the author has seen the plant described. 



The descriptions are our own. They are not intend- 

 ed for scientists, but for those who desire to identify 

 a strange plant and the effort has been to catch its most 

 prominent features and present them as clearly as pos- 

 sible. At the same time as far a,s possible we have 

 followed Wood and Gray and frequently refer to them. 

 The references in all cases to Wood's Classbook of 

 Botany," copyright 1 869, imprint A. S. Barnes &Co., 

 N. Y., 1873, and to '^Gray's Manual of Botany," copy- 

 right 1867, imprint Ivison, Blakemore, Taylor & Co., 

 1872, or the fifth revised edition, referred to as 5th Ed. 

 while Wood is referred to by name, Wood. The order 

 is nearly that of Gray's Manual 6th revised Ed. 



Flora LaSallensis. A catalogue of the Plants 

 of L/a Salle and adjacent counties of Illinois. 



PHAENOGAMIA OR FLOWERING PLANTS. 



Class I. Dicotyledons or exogenous plants: Stems 

 formed of bark, wood and pith, the latter often very 

 small and in large trees scarcely apparent, and .in- 

 creasing by the addition of new layers, usually one 

 each year, between the bark and wood. Stems branch- 

 ing, leaves of various forms, netveined. Plant when 

 it first appears or when the seed sprouts having two 

 leaves, from between which others spring. Flowers 

 generally having their parts in fives or fours. 



Sub Class I. Angiospermae: Seed contained in 

 an envelope, as the pea in a pod, the seeds in an apple, 

 the stone in a peach, &c. 



