CYPEKACEAE 51 



flowered, usually contiguous : perigynia l x/ long, round-ovate, hairy. 

 Very common in dry woods and on the prairie. April- May. 



27. C. varia Mubl. Resembles the last but staminate spike only 2 // -4 // 

 long, sessile : pistillate spikes 2-4 : perigynia oblong. Infrequent in dry 

 rocky woods throughout the northern part. April-May. 



28. C. umbellata Schk. Densely tufted, leaves \"-2" wide, often 1 

 long : spikes on scapes l / -2 / long, numerous, hidden among the leaves 

 or on short culms : pistillate spikes filiform-stalked or sessile at the base 

 of the solitary staminate spike, several-flowered, 2 // -4 // long : perigynia 

 l /x long, minutely hairy. In dry soil. Common near Dodson ; also found 

 north of Lee's Summit. April-May. 



29. C. pubescens Muhl. About 1J high, pubescent all over : stami- 

 nate spike sessile and inconspicuous : pistillate spikes 2-5, 4 // -10 // long, 

 erect and nearly sessile : perigynia ovoid, 2 X/ long, densely hairy. In 

 rich woods near Sibley and Independence. May-July. 



30. C. Jamesii Schwein. 12 7 or less high : leaves \\" wide, much ex- 

 ceeding the culms : spikes small, the staminate portion slender and in- 

 conspicuous, with 2-4 pistillate flowers at base ; perigynia globular, pro- 

 longed into a rough, two-edged, stout beak : lower scales bract-like and 

 foliaceous. Common in dark, rich woods throughout. May-June. 



31. C. conjuncta Boott. Culms weak, l-3 high, sharply triangular : 

 leaves often 4 /x wide : head I'-S 7 long, the lower spikes separated : bracts 

 inconspicuous : perigynia \\ ff long, lance-ovate, tapering into a rough 

 beak, about the length of the cuspidate scale. Not uncommon in moist 

 meadows and thickets in the northern part. May-June. 



32. C. stipata Muhl. Culms 2-3 high : leaves 2 // -4 // wide : head 

 1 X -4 X long, usually not branched, the spikes yellowish-brown and 

 crowded : perigynia lanceolate, 2 X/ long, the beak longer than the body 

 and much exceeding the scale. Frequent in moist meadows from Sheffield 

 and Adams to Sibley and Levasy. May-June. 



33. C. Crus-Corvi Shuttlw. Culms 2-4 high : leaves 5" or less 

 wide : head very compound, 4 / -12 / long : spikes yellowish-brown : peri- 

 gynia lanceolate, 4" long, the beak more than thrice the length of the 

 body : scale one-fourth the leugth of the perigynia. Locally common 

 around swamps at Sibley and Atherton. June-July. 



34. C. gravida Bailey. Culms 1-3J high : leaves l"-2" wide, usu- 

 ally shorter than the culm : the globular spikes aggregated in a short 

 (I'-lJ 7 long) oblong head, somewhat interrupted: perigynia broadly 

 ovate, 2 /x long, polished and widely spreading when ripe. Common in 

 dry soil, especially on dry prairies throughout the southern part. May- 

 June. 



Var. laxifolia Bailey. Leaves 3" wide : head dense, not interrupted. 

 Prairies near Lee's Summit. 



35. C. vulpinoidea Michx. Culms often 3 high, exceeded by the 

 leaves : head J/-5 7 long, usually interrupted, the numerous spikes 2 // -4 // 



