Jones: Flora of Illinois, 16. Sparganiaceae 41 



14. CuPRESSACEAE Neger 



l.BranchleU flattened in one plane; leaves all scale-like; cones woody 1. Thuja 



l.Branchlets not flattened; some or all of the leaves usually subulate; cones berry-like 

 or drupe-like, bluish, glaucous 2. Juniperus 



1. Thuja L. 

 T. occidentalis L. Arbor-vitae or Northern White Cedar. Ne. III., rare. 

 In III., chiefly on chffs and bluffs of St. Peter sandstone; also in tamarack 

 bogs. Known from La Salle, Kane, Cook, and Lake 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 Mich- 

 igan. [/. communis var. depressa Pursh; /. communis of auth., not L.; 



/. sibirica of auth., not Burgsd.} Low Juniper /. 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 abundant on 



bluffs and wooded slopes. [/. virgimana var. crebra Fern. & Grisc] 



Eastern Red Cedar /. virginiana L. 



2. Prostrate shrub; cones on recurved peduncles; sand dunes near Wauke- 

 gan and Lake Bluff, Lake Co., the most southerly stations for this 



species. [/. sabina of auth., not L.} Trailing Juniper 



/. horizontalis Moench 



Subdivision. 11. ANGIOSPERMAE. Flowering Plants 

 Class I. Monocotyledoneae Juss. 



15. Typhaceae J. St. Hil. — Cat-tail Family 

 1. Typha L. — Cat-tail 



1 . Staminate and pistillate parts of the spike usually contiguous, the latter 

 becoming 2-3 cm. in diameter at maturity; pollen-grains in fours; stigma 

 spatulate; marshes and margins of ponds, common. June-July. Common 

 Cat-tail T. latifolia L. 



1. Staminate and pistillate parts of the spike separated by a short interval, the 

 pistillate part only 1-2 cm. in diameter at maturity; pollen-grains simple; 

 stigma linear; marshes, less common than the preceding species. Narrow- 

 leaved Cat-tail T. angiistifolia L. 



16. Sparganiaceae Agardh — Bur-reed Family 

 1. Sparganium L. — Bur-reed 



l.Achenes obpyramidal, truncate at the summit, sessile; stigmas usually 2; 



ditches and margins of ponds. June-July. Giant Bur-reed 



S. eurycarpum Engelm. 



