. Un manuale di erbacce : con le descrizioni di tutti i più perniciosi e fastidioso piante negli Stati Uniti e in Canada, le loro abitudini di crescita e di distribuzione, con metodi di controllo . Le erbacce. POLYPODIACEAE {FERN FAMIGLIA) 19 gamma: Nord America Orientale da Terranova in Florida e a ovest verso il fiume Mississippi e in alcuni Stati membri dell'occidente. Habitat: suolo umido; prati umidi, prati, campi e boschi. Felci sono solitamente associati con boschi e canneti e, anche se questa può essere trovata in tali luoghi, è ugualmente adatta quando la crescita in terreno aperto, purché il terreno non è

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. A manual of weeds : with descriptions of all the most pernicious and troublesome plants in the United States and Canada, their habits of growth and distribution, with methods of control . Weeds. POLYPODIACEAE {FERN FAMILY) 19 Range: Eastern North America from Newfoundland to Florida and westward to the Mississippi River and in some states west. Habitat: Moist soil; wet meadows, pastures, fields, and woods. Ferns are usually associated with woodlands and thickets, and, though this one may be found in such places, it is equally well suited when growing in open ground, provided the soil is not dry. The plant frequents the society of the Field Horsetail and has a bad name with horsemen and sheep-keepers because of such com- pany. But those who have carefully investigated the matter say that the fern is not poisonous, the less noticeable Horsetail being responsible for the mischief gener- ally attributed to it. (Fig. 2). The plant springs from a creep- ing rootstock which is about a third of an inch in thickness and grows not far below the surface, branch- ing often and producing new fronds all summer until checked by frost, to which it is very sensitive. It is a rather coarse-looking plant, six inches to three feet high, the whole frond nearly triangular in outline but divided into oblong, lance- shaped, coarsely scalloped segments at the end of a (long stipe, or stalk. The leaf is light green and withers quickly when plucked. The fruit- ing fronds are much shorter than the sterile ones; they are twice pinnate, but the segments, or pin- nules, are at first so tightly rolled as to completely hide the sporangia and look like rows of green berries at- tached to the midrib; later they turn from green to brown, and remain stiffly standing all winter, after the green sterile fronds are withered and gone. Indeed, the fruiting fronds of two or three successive. Fig. 2. Sensitive Fern {Onoclea X*.. Please note that these images are extracted from scanned page images that may h

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• booksubjectweeds
• bookyear1919