By Richard Dickinson
Encyclopedic in scope, the booklet is the 1st to hide North American weeds at each degree of progress. The ebook is geared up by means of plant relations, and greater than species are featured. each one gets a two-page unfold with photos and textual content id keys. Species are prepared inside of kin alphabetically by means of clinical identify, and entries contain important info on seed viability and germination requirements.
Whether you think, like Donald Culross Peattie, that “a weed is a plant out of place,” or align with Elizabeth Wheeler Wilcox’s “weeds are yet unloved flowers,” Dickinson and Royer offer much-needed history on those intrusive organisms. within the conflict with weeds, wisdom really is strength. Weeds of North America is the ideal device for gardeners, in addition to somebody operating within the company of weed ecology and control.
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Graecizans auct. , A. pubescens (Uline & Bray) Rydb. Quick ID: plant prostrate; leaf undersides with prominent white veins; flowers green and axillary Origin: native to western North America Life Cycle: Annual reproducing by seed; large plants producing up to 15,000 seeds. 7 mm across; surface smooth and dull. Viable in soil up to 10 years. Germination stimulated by light and alternating temperatures; can occur at 7°C; optimal temperature 25–35°C; optimal depth 0–10 cm. 5 mm wide, pale green above and reddish-purple below; stem below cotyledons reddish-purple; first leaf oval with a shallow notch at tip.
Hoffmann wild chervil Also known as: cow parsley, bur chervil, woodland beakchervil, keck, mother die, adder’s meat, old rot, gypsy curtains, June flower Scientific Synonym(s): Chaerophyllum sylvestre L. Quick ID: leaves fernlike; umbels with six to 15 rays; flowers white Origin: native to Great Britain and Europe; introduced in wildflower seed mix; naturalized in Massachusetts by 1919 Life Cycle: Biennial or short-lived perennial reproducing by seed and lateral root buds; plants may produce up to 10,000 seeds.
Wild carrot is common on roadsides, pastures and waste areas. It is a host for the following viruses: cucumber mosaic, tobacco mosaic, tomato big bud, vaccinium false bottom, and aster yellows. The carrot rust fly affects both wild and cultivated carrot. Similar species: cultivated carrot (D. carota L. var. sativa) can be distinguished from wild carrot by its red, orange, or purple taproot. wi ld ca rrot ■ 29 Heracleum mantegazzianum Sommier & Levier giant hogweed Also known as: giant cow parsnip, cartwheel flower Scientific Synonym(s): H.