1. In the present paper the author deals anatomically with the leaves of four species of
Carices belonging to the Sect.
Hirtae.
2.
Carex hebecarpa var.
ligulata is an only species very characteristic in the structure of the leaves, and also in the external features. The other three species differ very much from the former and have many similarities with one another.
3. An analytical key to these four species follows.
1{Hinge cells thin-walled, conspicuously wavy. Spine cells found only in the margin. Silicated corpuscles many in the subsidiary cells of the stomata ...
C. ligulata Hinge cells thick-walled, almost even. Spine cells always found in the epidermis. Silicated corpuscles never in the stomata ... 2
2{Stomata ca. 40μ in length. Spine cells ovate, very shortly rostrate and very sharp at the point ...
C. Myabei Stomata 30μ in length. Spine cells in the upper epidermis lanceolate and somewhat long rostrate ...3
3{Spine cells found in the epidermis near the hinge cells. Fiber cells very thick-walled ...
C. lasiocarpa var.
occultans Spine cells never occurring in the epidermis near the hinge cells. Fiber cells not so thick-walled ...
C. drymophila var.
akanensis
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