40 American Midland Naturalist Monograph No. 2 



Division II. Spermatophyta. Seed Plants 



Subdivision I. GYMNOSPERMAE. Gymnosperms 



11. Taxaceae Lindl. — Yew Family 



1. Taxus L. — Yew 



T. canadensis Marsh. Canada Yew. Ground-hemlock. Wooded hillsides 

 near streams, rare; n. 111.; known from Jo Daviess, Winnebago, Carroll, Ogle, 

 Lee, La Salle, and Kankakee counties. 



12. PiNACEAE Lindl. — Pine Family 



1 . Leaves in fascicles or clusters. 



2. Leaves evergreen, in fascicles of 2-5, surrounded at the base by a sheath; cones 



maturing the second year ....1. Pimis 



2. Leaves deciduous, in clusters of 25-50 on short lateral spurs; cones maturing the 



first year 2. Larix 



1 . Leaves scattered along the branchlets, evergreen; cones maturing the first year; 



branchlets roughened by the persistent, leaf-bases; leaves obtuse, flattened, short- 



petioled, soon deciduous from the twigs when dry 3. Tsiiga 



1. Pin US L. — Pine 



1. Leaves five in each fascicle, slender, bluish green, 6-12 cm. long; 'each leaf 

 with one vascular bundle; cones cylindrical, often curved, pendent, 10-15 

 cm. long; n. 111.; known from Lake, Jo Daviess, Carroll, Ogle, Lake, and 



La Salle counties. White Pine P. strobus L. 



1. Leaves two or three in a fascicle; each leaf with two vascular bundles. 



2. Leaves 2-4 cm. long, rigid, twisted, spreading; cone-scales spineless; n. 111., 



in Lake, Cook, and Ogle counties. Jack Pine P. banksiana Lamb. 



2. Leaves 7-12 cm. long, straight; cone-scales with a sharp prickle about 1 

 mm. long; s. 111., in Union, Jackson, and Randolph counties. Short- 

 l-eaf Pine P. echinata Mill. 



2. Larix Adans. — Larch 



L. laricina (DuRoi) K. Koch. Tamarack or American Larch. Bogs in Lake 

 and McHenry counties. 



3. TsuGA Carr. — Hemlock 



T. canadensis (L.) Carr. Sandstone bluffs, western Indiana (Parke Co.), 

 and in Wisconsin, but not yet discovered in Illinois. 



13. Taxodiaceae Neger 



1. Taxodium Rich. — Bald Cypress 



T. distichum (L.) Rich. Swampy ground in s. 111., extending northw. to 

 Lawrence and Marion counties. 



