Botrychium Sw.
Descripción
Stem subterranean, erect, fleshy; roots thick, fleshy; fronds mostly one (rarely two), with two distinct parts: a spreading pinnately to ternately divided sterile blade (sometimes called trophophore), with free veins, and an erect fertile portion (sometimes called sporophore), 2–3 times divided, each sporophore stalked and terminated by a panicle-like sporangial cluster, usually exceeding the sterile blade in length, arising from base of the sterile blade or lower on stipe, sometimes at or below ground level; sporangia large, globose, opening by a horizontal slit; spores tetrahedral, one thousand to several thousand per sporangium; gametophytes subterranean, whitish or brownish, mycorrhizal, non-green; x=45.A
Forma de vida
TerrestreA
Distribución
México (Country) native and not endemicB
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
Botrychium comprises about 60 species, largely of temperate regions, usually growing in pastures, grassy meadows, and open second-growth woodlands, often in areas of disturbance.
There is considerable variation in frond size and dissection, and this variation is further confounded by the tendency to form “genus communities” with two or three species present in a population. Twenty new species have been recently described in North America, showing that much work is needed for a full understanding of the genus. Highland pastures and grassy road shoulders should be searched for more populations of these unusual plants. For studies of variation, all fronds should be taken, leaving the underground stems unharmed to produce new fronds the following season.
A
There is considerable variation in frond size and dissection, and this variation is further confounded by the tendency to form “genus communities” with two or three species present in a population. Twenty new species have been recently described in North America, showing that much work is needed for a full understanding of the genus. Highland pastures and grassy road shoulders should be searched for more populations of these unusual plants. For studies of variation, all fronds should be taken, leaving the underground stems unharmed to produce new fronds the following season.
A