884 



836. CAREX. 



836. CAREX. 



A. Flowers in a simple spike. 

 i. Stigmas 2. 



a. Spike dioecious. Sp. 1, 2. 



b. Spike complete. Sp. 3-6. 

 ii. Stigmas 8. Sp. 7-11. 



B. Spikes in an involucred head! Sp. 12, 

 13. 



C. Spike compomid. 



i. Stigmas 3. Sp. 14. 

 ii. Stigmas 2. 



a. Barren Flowers at the top of each 

 spicule. 



* Root not creeping. Sp. 15-20. 



** Root creeping. 



t Beak round, obliquely truncate. 

 Sp. 21, 22. 



ft Beak compressed, bidentate. 

 Sp. 23-27. 



b. Arrangement of Flowers irregular. 

 Sp. 28-33. 



c. Barren Flowers at base of each spi- 

 cule. 



* Root creeping. Sp. 34-37. 

 ** Root fibrous, tufted. 



t Beak bidentate. Sp. 38-43. 

 ft Beak nearly entire or wanting. 

 Sp. 44-49. 



D. Spikes distinct, all complete. Barren 

 Flowers at top.» Sp. 50, 51. 



E. Spikes separate ; terminal complete ; 

 barren at base ; lateral fertile. Sp. 52-57. 



P. Catkins separate; upper barren. Stig- 

 mas 2. 



i. Fruit terminating in a flattened and 

 margined beak. Sp. 58-60. 



ii. Beak round, and short or wanting. 



a. Barren spike solitary (rarely 2). 



* Beak ending in 2 teeth. Sp. 61, 

 62. 



** Mouth entire, or splitting on one 

 side. Sp. 63-67. 



b. Barren Spikes 2 or more. 



* No fertile Flowers at base of barren 

 spikes. Sp. 68-72. 



** Fertile Flowers at base of barren 

 spikes. Sp. 73. 

 G. Catkins separate; upper barren. Stigmas 

 3. Barren Spike solitary. 



i. Beak short, membranous, or -wanting. 



a. Spikes nearly sessile. 



* Spikes approximate at top of culm. 

 Sp. 74-85. 



** Catkins disposed along the 

 culm. Sp. 86. 



b. Spikes corymbose. 



* Fruit smooth. Beak 0. Sp. 87- 

 90. 



** Fruit smooth. Beak round, mem- 

 branous. Sp. 91-94. 



*** Fruit hairy. Bracts membra- 

 nous. Sp. 95-96. 



c. Spikes racemose along culm. 



* Very long and slender. Sp. 97- 

 100. 



** Rather lax, but not very long. 

 101-104. 



ii. Fruit with a plano-convex, bidentate 

 beak. 



a. Spikes almost all on slender stalks, 

 confined to upper part of culm. Sp. 

 105-107. 



b. Spikes approximate, nearly sessile 

 near top of culm. Sp. 108-111. 



c. Spikes racemose along culm. 



* Fruit smooth, except on margin. 

 Lower Stalks hardly half exsert. 

 Sp. 112-117. 



** Fruit smooth, except on margin. 

 Lower Stalks more than half ex- 

 sert. Sp. 118-121. 



*** Fruit rough. Sp. 122. 

 iii. Fruit beaked ; but the mouth small, 

 membranous, and uncertain in its form. 

 Sp. 123-126. 



H. Barren Spikes more than one. 

 i. Beak none. Sp. 127-129. 

 ii. Beak membranous. Sp. 130-132. 

 iii. Break firm, bidentate. 



a. Fruit hairy. Sp. 133-135. 



b. Fi-uit without hairs. Sp. 136-141. 



A. Catkin solitary. 



i. Stigmas 2. 

 a. S'pike dimcious. 



1. dioica. Fr. nearly erect, many-nerved. 

 Culm and L. smooth, p. 6, 7- Boys. occ. 

 n. and m. Europe. 



2. davalliana. Fr. deflexed, ribbed. Culm 



