Fimbristylis ferruginea subsp. ferruginea

Fimbristylis sublateralis Steud. Syn. Cyp. 114. 1855, e descr Fimbristylis polymorpha Bock. Linnaea 37 : 14. 1871. Fimbristylis diphylla var. pluristriata Clarke in Hook. f. Fl. Brit. Fimbristylis alamosana Fernald, Proc. Am. Acad. 36: 491. 1901. Fimbristylis Holwayana Fernald, Proc. Am. Acad. 36: 492. 1901. Fimbristylis ophiticola Britton, Mem. Torrey Club 16 : 60. 1920.
81. 1820. UVilldenow 1273, South America 81. 1820. [WiUdenow 1270 from the Orinoco 85. 1824.
1837. (Willdenow 1222 from
74. 1842. (Guatemala.)
Ind. 6: 637.
(Mexico.)
(Mexico.) (Camaguay, Cuba.)
1893. (India.) Fimhristylis annua var. diphylla Kiikenth. Repert. Sp. Nov. 23 : 196. 1926. Fimbristylis annua f. brizoides Kiikenth. Repert. Sp. Nov. 23 : 196. 1926. Fimhristylis annua f. tomentosa Kiikenth. Repert. Sp. Nov. 23 : 196. 1926. Fimbristylis annua f. oblonga Kiikenth. Repert. Sp. Nov. 23 : 196. 1926. (Cuba.) Fimbristylis darlingtoiiiana Pennell, Bartonia 15: 30. 1933. (Pennsylvania.) Fimbristylis dichotoma f. annua Ohvvi, Jour. Jap. Bot. 14 : 577. 1938. Fimbristylis dichotoma f. tomentosa Ohwi, Jour. Jap. Bot. 14 : 578. 1938. Fimbristylis diphylla var. tomentosa Barros, Anal. Mus. Argent. Ci. Nat. 41 : 328. 1945.
Annual or perennial ; culms glabrous to pubescent, slender, O.S-7 dm. high ; leaves linear,
flat, 1-3 mm. wide, frequently denticulate at the apex, often glaucous or pubescent, shorter
than the culms, the involucral leaves 2-4, not elongate; umbel simple or compound, loose,
with slender rays; spikelets oblong to ovoid, acute, 5-10 mm. long; scales ovate, acute;
achene obovate, lenticular, 1.0 mm. long, white to pale buff (rarely brown), with about ten
rows of horizontally elongated cells on each face and about ten longitudinal ribs formed by
the cell margins, the surface also frequently verrucose; style prominently flattened with
slightly enlarged base, bifid, fimbriate below the bifurcation and sometimes to the base;
stamens 2, or frequently 1.
Type locality : India.
Distribution : Pennsylvania to Florida and Texas ; north in the flat country to Illinois and Missouri ; tropical and warm regions of the Old and New Worlds.