Scientific Name
Carex rugulosa Kuk. 큰천일사초
Subgenus classification
: Carex.
Habitats
Occurs in Gangwon or Seoul, Gyeonggi, and it lives in coastline.
Stem
Scattered growth, with basal sheath color dark brown to reddish brown, and length about 50-80 cm.
Leaves
Leaves similar to the stem, have glabrous surfaces, width about 5-10 mm.
Inflorescence
The number of spikes two or more. Spike shapes different (showing distinct sexual characteristics), with all spikes unisexual, spikes arranged loosely. Terminal spike sexuality staminate. Lateral spike sexuality pistillate, and erect to ascend. Lateral spike length about 2-4 cm. Terminal spike length about 1-3.5 cm. Number of spikes per node one (one spike in one bract).
Bract
Lowermost bract shape leaf-like.
Glume
Staminate glume awn absent. Pistillate glume awn short (awn less than one-third of the total length). Pistillate glume color dark brown to blackish brown.
Perigynium
Transverse section trigonous to terete. Perigynium shape ovate-lanceolate (the broadest part near the base), and densely flowered. Perigynium glabrous. Beak short (beak less than one-third of the total length) or long (beak more than one-third of the total length), thick (the beak is not distinguished from the perigynium , and the starting point of the beak is more than one-third of the widest part of the perigynium), with bidentate to bifid mouth. Length 5-6 mm.
Achene
Appendage absent, no constrictions.
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