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EXPLANATION OF PLATE IL 



Figure 1. — The ochrea of a female inflorescence of Carex crinita Lam. 3 x 



natural size. 

 Figure 2. — A specimen of Carex laxiflora Lam. with abnormally developed 



female inflorescence. The lowest situated stem-leaf has been removed 



so as to show the ochrea at the base of the peduncle. 2 x natu- 

 ral size. 

 Figure 3. — The ochrea of the preceding ; much enlarged. 

 Figure 4. — A lateral male spike of Carex crinita Lam., which is developed upon 



the rhacheola of a basal female flower. 3 x natural size. 

 Figure 5. — A female inflorescence of Carex longirostris Torr. with the rhacheola 



of a flower extended and bearing three female flowers. 3 x natural 



size. 

 Figure 6. — A female flower of the preceding, showing a similar prolongation of 



the rhacheola ; much enlarged. 

 Figure 7. — Two utriculi, with stamens from an abnormally developed specimen 



of Carex acuta L., copied from Boott: Illustr. of the genus Carex^ 



vol. iv, p. 166. 

 Figure 8. — A lateral inflorescence of Carex cladostachya Wahlbg., showing the 



ochrea {oc.) and four lateral inflorescences, female at the base and 



male at the apex. 2 x natural size. 

 Figure 9.— One of the basal utriculi of the preceding, from which the lateral 



inflorescences develop. This utriculus did not contain any female 



flower, and, as shown in the figure, had the position of an ochrea : 



at the base of the lateral peduncle ; much enlarged. 

 Figure 10. — The inflorescence of Carex multicaulis Bailey, showing one terminal 



male spike and two lateral female inflorescences, supported by bracts 



with distinct green blades ; much enlarged. 



Washington, April, 1896. 



