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.