Agrostis perennans (autumn bent grass)718 -- grows in clumps, leafy at base; delicate branches, fls us pale green, sometimes purple

Agrostis stolonifera (creeping bent grass) 718

Agrostis viridis (green bent grass) Poaceae 718 --

Ailanthus altissima (tree-of-heaven) Simaroubaceae (5 5 10 2-5 hypo) 335 -- greenish or gr-yellow fls; ADT lflts 11-41

Aira caryophyllea (silver hairgrass) Poaceae 713 -- dry soil in open pls. mostly on the coast

Aira praecox (early hairgrass) Poaceae 713 -- dry sandy soil near the coast

Aizoaceae (fig marigold) -- Sesuvium (sea-purslane)

Ajuga genevensis (standing bugleweed) Lamiaceae ((5) (5) 2+2 1) 408 --

Ajuga reptans (carpet bugleweed) Lamiaceae ((5) (5) 2+2 1) 408 -- stamens project beyond very short upper lip; OT blunt, egg

Akebia quinata (akebia) Lardizabalaceae (0 3or6 3or6 ?) 063 --

Albizia julibrissin (silk tree) Mimosaceae (5 5 N 1) 255 --

Alchemilla vulgaris (lady's mantle) Rosaceae (0 4 4 1) 235 -- Eurasian intro

Aletris aurea Liliaceae (3 3 6 3) 785

Aletris farinosa (colic root) Liliaceae (3 3 6 3) 785 -- fls whitish, tubular w a small bract underneath

Alisma gramineum (grass-leaved water plaintain) Alismataceae ( 3 3 6 10-28 perf or unisex) 602 -- lvs us submerged, very thin, linear

Alisma subcordatum (southern water plaintain) Alismataceae ( 3 3 6 10-28 perf or unisex) 603 -- fls smaller, us. in shallow water

Alisma triviale (northern water plaintain) Alismataceae ( 3 3 6 10-28 perf or unisex) 602 -- lvs us long-petioled, blade to brd ovate

Alismataceae (water plaintain) -- Alisma, Echinodorus, Sagittaria

Alliaria petiolata (garlic mustard) Brassicaceae (4 4 4+2 1) 180

Allium ampeloprasum (wild leek) 791 -- lvs flat or keeled; Eurp weed

Allium canadense (Canada onion) 789 -- whitish or pink, few-fl'd & long stlkd; flowerless stalk-like projections in infl; BE; lvs flat or keeled

Allium cepa (cultivated onion) 709 -- lvs terete (round)

Allium cernuum (nodding onion) 790 -- white or pink fl cluster, nodding w/out bulbs; BE flat or keeled

Allium oleraceum (field garlic) 791 -- lvs flat or keeled

Allium sativum (garlic) 791 -- lvs flat or keeled

Allium schoenoprasum 790 -- lvs terete

Allium sp. (wild onion) Liliaceae (3 3 6 3) --

Allium tricoccum (wild leek or ramps) 790 -- white at end of naked stalk; NONE; lvs absent at maturity

Allium vineale (field garlic) 790 -- purplish or greenish fls; AE terete, very narrow, hollow

Alnus glutinosa (black alder) -- tip of lf looks as if snipped-off

Alnus incana v. americana (speckled alder) -- lvs dbly serrate; 8-14 mn veins on a side; lf pale & glcs beneath

Alnus serrulata (smooth alder) -- 8-14 main veins; lf green & glabrous beneath

Alnus sp. (alder) Betulaceae 084 --

Alnus viridis var. crispa (green alder) -- 6-9 main veins on a side; lf green & shiny beneath

Alopecuris aequalis (short-awn foxtail grass) 720 -- glumes obtuse; ciliate; no awns showing; mud or shallow water

Alopecuris carolinianus (Carolina foxtail grass) 720 -- glumes obtuse; ciliate; wet soil

Alopecuris geniculatus (marsh foxtail grass) 720 -- glumes obtuse; ciliate; mud or shallow water

Alopecuris myosuroides (European foxtail grass) 720 -- glumes acute; ciliate only at base; fields & waste pls.

Alopecuris pratensis (meadow foxtail grass) 720 -- glumes acute; ciliate; moist meadows, fields, waste pls.

Alopecuris sp. (Foxtail grass) Poaceae 720 -- looks like a thiner foxtail grass (Setaria spp.)

Althaea officinalis (marsh mallow) Malvaceae (5 5 5 1 hypo) 134 -- fls pale-rose 1-1.5" wide; velvety, gray-green plant

Althaea rosea (holly hock mallow) Malvaceae (5 5 5 1 hypo) 134 --

Alyssum alyssoides Brassicaceae (4 4 4+2 1) 168 --

Amaranthaceae (amaranth) -- Amaranthus; Celosia; Froelichia

Amaranthus albus (tumbleweed) 094 -- fls in small axillary clusters; fields & waste pls.

Amaranthus cannabinus (salt-marsh water hemp) 097 -- fls in large terminal panicles; plants dioecious; lvs narrowly lance; salt & tidal marshes

Amaranthus crispus 094 -- fls in small axillary clusters; occ in waste pls.

Amaranthus blitoides -- fls in small axillary clusters; prostrate; common as a weed

Amaranthus retroflexus (rough pigweed) 095 -- fls in elongate, terminal panicles; common weed

Amaranthus sp. (pigweed) Amaranthaceae (0 1-5 1-5 0/0 1-5 0 3) -- lots of w. introductions

Amaranthus spinosus (spiny amaranthus) 095 -- fls in elongate, terminal panicles; pantropical weed

Amaranthus viridis (green amaranthus) 096 -- fls in elongate, terminal panicles; occ adventive Ambrosia artemisiifolia (common ragweed) Asteraceae/Heliantheae 515 -- divided lvs

Ambrosia bidentata (lanceleaf ragweed) Asteraceae/Heliantheae 515 -- lvs trilobed

Ambrosia trifida (giant ragweed) Asteraceae/Heliantheae 515 -- lvs trilobed

Amelanchier alnifolia (western shadbush) Rosaceae (5 5 N 5) 253 --

Amelanchier arborea (downy shadbush) Rosaceae (5 5 N 5) 254 -- 12-15mm+ pet; pedicels to 20 mm, often silky

Amelanchier bartramiana (mountain serviceberry) Rosaceae (5 5 N 5) 253 --

Amelanchier canadensis (eastern shadbush) Rosaceae (5 5 N 5) 254 -- 4-12mm pet; pedicels 5-15mm, tomentose; lf teeth absent last 1/4

Amelanchier fernaldii (St. Lawrence shadbush) Rosaceae (5 5 N 5) 254 --

Amelanchier laevis (smooth shadbush) Rosaceae (5 5 N 5) 255 -- 15-22mm pet; pedicels 10-30mm, glabrous

Amelanchier obovalis (coastal plain shadbush) Rosaceae (5 5 N 5) 254 --

Amelanchier sanguinea (New England shadbush) Rosaceae (5 5 N 5) 254 --

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