1 . Magnoliaceae 49 



2. Leaves 2-4 cm long, rigid, twisted, spreading; cone-scales spine- 

 less; n. 111., in Cook and Lake counties, and formerly in Ogle 

 Co. Jack Pine P. banksiana Lamb. 



2. Leaves 7-12 cm long, straight; cone-scales with a sharp prickle 

 about 1 mm long; s. 111., Jackson, Randolph, and Union 

 counties. Shortleaf Pine P. echinata Mill. 



2. Larix Mill. 

 L. laricina (DuKoi) K.Kocli. Tamarack or American Larch. Bogs 

 in Cook, Lake, and McHenry counties. 



3. Taxodiaceae Schimper 



1. Taxodium Rich. 



T. distichum (L.) Rich. Bald Cypress. Swampy ground, s. 111., 

 extending northward to Lawrence and Marion counties. 



4. Cupressaceae Horan. 

 1. Branchlets flattened in one plane; leaves all scale-like; cones woody 



1. Thuja 



I. Branchlets not flattened; some or all of the leaves usually subulate; cones 



berry-like or drupe-like, bluish, glaucous 2. Juniperus 



1. Thuja L. — Arbor- vitae. White Cedar 

 T. occidentalis L. Chiefly on cliffs and bluffs of St. Peter sand- 

 stone; also in tamarack bogs; known from Cook, Kane, Lake, and La 

 Salle counties; also Peoria, Brendel in 1853, but now extinct there. 



2. Juniperus L. — Juniper 



1. Leaves all subulate, sharp-pointed, mostly in threes, 7-15 mm 



long; low shrub with spreading or decumbent branches; sand 



dunes near Lake Michigan; Cook and Lake counties. Low 



Juniper [/. communis var. depressa Pursh ; /. communis of 



auth., non L.] /. canadensis Burgsd. 



1. Leaves of two kinds, scale-like on the mature branchlets, subulate 

 on the young growth, mostly opposite. 

 2. Tree 10-25 m tall; cones on straight peduncles; locally abun- 

 dant on bluffs and wooded slopes. Eastern Red Cedar [/. 



virginiana var. crebra Fern. & Grisc] /. inrginiana L. 



2. Prostrate shrub; cones on recur\ed peduncles; sand dunes near 

 Waukegan and Lake Bluff, Lake Co., the most southerly 



stations for this species. Trailing Juniper 



/. horizontalis Moench 



Subdivision II. Angiospermae. Flowering Plants 



Class I. Dicotyledoneae (Juss.) DC. 

 1 . Magnoliaceae J.St.Hil. — Magnolia Family 



1. Leaves entire, acute or acuminate; buds pubescent 1. Magnolia 



1. Leaves with a truncate apex and two broad lateral lobes; buds glabrous 



2. Liriodendron 



