Anemia hirsuta Sw.

  • Authority

    Mickel, John T. & Beitel, Joseph M. 1988. Pteridophyte Flora of Oaxaca, Mexico. Mem. New York Bot. Gard. 46: 1-580.

  • Family

    Anemiaceae

  • Scientific Name

    Anemia hirsuta Sw.

  • Description

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    Species Description - Rhizome horizontal, compact, short-creeping, 2-6 mm diam.; rhizome hairs orange; fronds erect (6-) 12-32 cm tall; stipe 1/3-2/3 the frond length, 0.5-0.9 mm diam., stramineous, hirsute; blade narrowly oblong, occasionally deltate, once-pinnate, the lower pinnae deeply incised with 1-several segments, chartaceous; pinnae 6-10 pairs, opposite to subopposite, oblong, cuneate at base, often excavate on lower margin, apex obtuse, margin minutely erose-denticulate, lamina hirsute; veins free; fertile pinnae approximate to the sterile pinnae, usually far surpassing the sterile blade in height; spores tetrahedral, striate, ridges smooth, distant.

  • Discussion

    Osmunda hirsuta Linnaeus, Sp. pl. 2: 1064. 1753. Ornithopteris hirsuta (Linnaeus) Bernhardi, Neues J. Bot. 1(2): 50, t. 3, f. 15b. 1806 [1805]. Type. Plumier, Traité foug. Amér., t. 162. 1705, based on a plant collected in Hispaniola, and also figs, of Sloane and Petiver. Anemia hirsuta var. achillaeifolia Martens & Galeotti, Mém. foug. Mexique 20. 1842. Type. Mexico. Oaxaca: Dist. Juquila, Zacatepec & Juquila, Galeotti 6363 (BR!; isotypes BR!, GH!, LE!). Several other synonyms and splinter taxa have been described from South America. Anemia hirsuta is one of the most common and widespread species of the genus. It hybridizes with several other species in Mexico, including A. affinis, A. jaliscana, A. karwinskyana, A. pastinacaria, A. phyllitidis, and A. tomentosa. This species is extremely plastic in its morphology, ranging from small to large, the pinnae nearly undivided to extremely lacerated, the blade form ranging from narrowly oblong to deltate. Some of its forms are indistinguishable externally from some of the hybrids, such as A. hirsuta x jaliscana. Its incised pinnae make a good marker for crosses with species with undivided pinnae.

  • Distribution

    Open to mostly shaded grassy slopes and trail banks; Centro, Choapan, Cuicatlán, Jamiltepec, Juchitán, Juquila, Mixe, Pochutla, Putla, Sola de Vega, Tlacolula, Villa Alta, Yautepec; 40-1700 m. Mexico (Sin, Nay, Jal, Mich, Gro, Mex, Mor, Ver, Oax, Chis), Guat to Pan; Jam, Hisp, PR; Col & Ven to Braz & Bol.

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