By Richard Dickinson

“What is a weed,” opined Emerson, “but a plant whose virtues haven't but been discovered?” whereas that is a important thought in conception, those vegetation of undiscovered advantage reason never-ending hours of toil for yard gardeners. anywhere they take root, weeds compete for assets, and ordinarilly win. additionally they wreak havoc on industry—from agriculture to golfing classes to civic panorama initiatives, enormous quantities of cash are spent to eliminate those virile and flexible invaders. With loads at stake, trustworthy details on weeds and their features is important. Richard Dickinson and France Royer make clear this complicated international with Weeds of North the USA, the crucial reference for all who desire to comprehend the technological know-how of the omnipotent weed.

Encyclopedic in scope, the e-book is the 1st to hide North American weeds at each degree of development. The ebook is geared up through plant kin, and greater than species are featured. each one gets a two-page unfold with pictures and textual content identity keys. Species are prepared inside kin alphabetically by way of medical identify, and entries contain important details 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 supply much-needed history on those intrusive organisms. within the conflict with weeds, wisdom really is strength. Weeds of North America is the best software for gardeners, in addition to someone operating within the company of weed ecology and control.

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Leaves Absent Lemna trisulca, page 46 Leaves Alternate Potamogeton crispus, page 636 K ey to A q uat i c Pl a nts ■ xxix Leaves Basal Eichhornia crassipes, page 624 Pistia stratiotes, page 48 Hydrocharis morsus-­ranae, page 410 Leaves Opposite Elodea canadensis, page 406 Leaves Whorled Salvinia molesta, page 680 Myriophyllum aquaticum, page 396 Myriophyllum spicatum, page 398 Egeria densa, page 404 Elodea canadensis, Hydrilla page 406 verticillata, page 408 Key to Grasses and Grasslike Plants Plants in this key have been arranged according to their inflorescence and presence or absence of auricles and ligules.

Poison hemlock Also known as: deadly hemlock, poison parsley, snakeweed, wode whistle, poison stinkweed, St. Bennet’s herb, bad man’s oatmeal, cashes, bunk, heck-­how, poison root, beaver poison Scientific Synonym(s): Coriandrum maculatum Roth, Sium conium Vest Quick ID: stem purple-­ spotted and hollow; leaves fernlike; flowers white, borne in umbels Origin: native to Europe, northern Africa, and western Asia; introduced as an ornamental plant Life Cycle: Biennial or perennial reproducing by seed only; large plants may produce up to 38,000 seeds.

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.

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