Anemia mexicana Kl.

Stems ca. 2 mm diam. Leaves partially dimorphic (sporangia limited to proximal pair of pinnae), (15--)22--45 × 8--16 cm. Petiole straw-colored, 1/2--2/3 length of leaf, ca. 1 mm wide, glabrate. Blade deltate-lanceolate, 1-pinnate, somewhat leathery. Pinnae 4--7 pairs, mostly alternate, lanceolate, base truncate, margins minutely serrulate, proximal margins often slightly excavate, apex acuminate, hirsute with minute white hairs to glabrous on abaxial surface, glabrous adaxially. Fertile pinnae usually taller than sterile blades. Spores with ridges parallel and closely placed. 2 n = 76.

Tex.; n Mexico.

Lightly shaded limestone outcrops of the Edwards Plateau; 400--500m.

Anemia mexicana Klotzsch, I^innaea 18 : 526. 1844
Ornithopteris mexicana Underw. Our Nat. Ferns ed. 6. 76. 1900.
Rhizome creeping, thickly clothed with acicular turgid blackish or dark-brown hairs ; fronds several, dorsal, distichous, close, the stipes of the fertile fronds not equaling the sterile fronds. Fertile fronds 25-50 cm. long; stipe 13-28 cm. long, slender or usually stoutish, dull-stramineous from a darker base, canaliculate along the ventral face, often angled in drying, at first dark-fibrillose near the base, glabrate above; sterile lamina deltoid-ovate, usually very broadly so, 7-23 cm. long, 7-20 cm. broad, acute, once-pinnate, the rachis stramineous, canaliculate along the ventral face, glabrate or with a few blackish acicular hairs at the side ; pinnae 3-7 pairs, contiguous or half their width apart, spreading, the lowermost the largest, petiolate, lanceolate-oblong to ovate-lanceolate, acute or attenuate, subcordate-truncate at the base, or the lower side exciso-cuneate ; middle pinnae similar, gradually smaller, subequilateral at the base, the upper ones free, sessile, or the uppermost on either side confluent with the terminal segment, this usually larger than the pinna below, inequilateral, cuneate, subcordate or sometimes unequally hastate ; leaf-tissue rigidly membrano-chartaceous, dull-green and glabrous above, paler and minutely glandular below; costae nearly medial, conspicuously elevated, stramineous; veins very oblique, repeatedly dichotomous, very close, distinctly elevated upon both surfaces, fibrillose-hirtous below or often nearly glabrous ; margins thickened, sharply and unevenly serrulate-denticulate ; fertile pinnae 9-30 cm. long, invariably surpassing the sterile lamina, often greatly so, the panicle as long as the stalk or longer, flattish or the divisions somewhat involute, short, the lower and middle ones petiolate, remote, the upper ones simpler, shorter, densely crowded; spores closely cristatestriate, the ridges somewhat flexuous. Sterile fronds shorter, 13-45 cm. long, the stipe and lamina about equal; lamina 13-25 cm. long, 11-18 cm. broad, deltoid-ovate to oblong-ovate, otherwise as in the fertile frond ; pinnae 4-7 pairs. Type locality : Mexico.
Distribution ; Western Texas, soutliward to the states of Tamaulipas, Coahuila, Nuevo Leon and Morelos, Mexico.

Anemia mexicana, the Mexican flowering fern, is a fern species in the genus Anemia, sometimes called flowering ferns. It is native to much of Mexico and the Edwards Plateau and Trans-Pecos regions of Texas. The "flowers" are upright fertile fronds that can be mistaken for true flowers.

Anemia mexicana là một loài dương xỉ trong họ Anemiaceae. Loài này được Klotzsch mô tả khoa học đầu tiên năm 1844.