Salix eriocephala (diamond willow) 157 -- shrub; glabrous fr;

Salix exigua (sandbar willow) -- colonial shrub; glabrous or pubescent fr; catkins with the lvs

Salix fragilis (crack willow) 155 -- glabrous fr; twigs greenish to dark red; lvs lance to 7", toothed, lt green beneath

Salix humilis (low willow) 159 -- shrub; pubescent fr; hairy beneath, larger

Salix lucida (shining willow) Salicaceae (0 x 3-8 2stigmas) 154 -- shrub or small tree; glabrous fr;

Salix nigra (black willow) Salicaceae (0 x 3-8 2stigmas) 154 -- shrub or tree; glbrs fr; lvs lng lance, dp grn over paler; lrge stipules, often deciduous

Salix occidentalis (willow) -- shrub; pubescent fr; lvs hairy beneath, smaller

Salix pedicellaris (willow) -- shrub; glabrous fr; lvs entire

Salix petiolaris (willow) -- shrub/tree; pubescent fr;

Salix purpurea (willow) Salicaceae (0 x 1 2stigmas) -- shrub; pubescent fr;

Salix sericea (willow) -- shrub or small tree; pubescent fr; brown branchlets; lvs lance to 4", finely toothed, silky beneath

Salix sp. (willow) Salicaceae (0 x 2 2stigmas) 154-160 --

Salix viminalis (silky osier willow) 160 -- shrub/tree; pubescent fr; Salsola collina Chenopodiaceae (0 5 5 2) 093

Salsola kali (common saltwort) Chenopodiaceae(0 5 5 2) 094 -- lvs thornlike; fls green

Salsola tragus (Russian thistle) Chenopodiaceae (0 5 5 2) 094 -- lvs less rigid & longer Salvia lyrata (lyre-leaved sage) Lamiaceae ((5) (5) 2 1) 429-430 -- violet fls; OL in rosette; stem lvs OE; stem hairy Sambucus canadensis (elderberry) Caprifoliaceae ((5) 5 5 1 half to wholly inf) 485 -- OD 5-11 lflts, us 7, egg, sharply toothed

Sambucus ebulus (dwarf elderberry) Carprifoliaceae ((5) 5 5 1 half to wholly inf) 485 -- lanceolate lvs

Sambucus racemosa (red elderberry) Caprifoliaceae ((5) 5 5 1 half to wholly inf) 485 -- OD lflts 5-7 lance or egg, toothed Samolus floribundus (water pimpernel) Primulaceae ((5) 5 5 1) 203 -- fls white, very small, long-stalked; lvs AE, spatulate

Sanguinaria canadensis (bloodroot) Papaveraceae (8-6 2 N 1) 064 --

Sanguisorba canadensis (American burnet) Rosaceae (0 4 4 1) 237

Sanguisorba minor (salad burnet) Rosaceae (0 4 4 1) 237

Sanguisorba officinalis (great burnet) Rosaceae (0 4 4 1) 237 --

Sanicula canadensis (Canada sanicle) Apiaceae (5 5 5 2) 346 -- lflts 3, 2 of them deeply cleft; frs roundish

Sanicula gregaria (cluster sanicle) Apiaceae (5 5 5 2) 346 -- lvs us. w/ 5 lflts; fls greenish-yellow

Sanicula marilandica (black sanicle) Apiaceae (5 5 5 2) 346 -- side lflts so deeply cleft, appear as 7

Sanicula trifoliata (beaked sanicle) Apiaceae (5 5 5 2) 346 -- lflts 3, frs longer than wide

Santalaceae (sandalwood) -- Comandra

Santolina chamaecyparissus Asteraceae/Anthemideae 518

Saponaria officinalis (bouncing bet) Caryophyllaceae (5 5 10 2) 111 -- pink or white; pets reflexed; OE oval, 3-5 prominent ribs

Sarracenia flava (pitcher plant) Sarraceniaceae (5 5 N 2) 138

Sarracenia purpurea (pitcher plant) Sarraceniaceae (5 5 N 2) 138 --

Sassafras albidum (sassafras) Lauraceae (6 t 9 N) 039 --

Satureja acinos (mother of thyme basil) Lamiaceae ((5) (5) 2+2 1) 413 -- stem branched at base; pale purple axillary fls; lvs sessile or near

Satureja hortensis (summer savory basil) Lamiaceae ((5) (5) 2+2 1) 413 -- 3 forked at stem top; pale pink-purple to white; lvs linear, often revolute

Satureja vulgaris (wild basil) Lamiaceae ((5) (5) 2+2 1) 413 -- fls pinkish or lilac 1/4-1/2" conglomerated around stem & axils; OE tri; hairy stem

Saururus cernuus (lizard's tail) Saururaceae (0 0 6or8 3-5) 039 --

Saxifraga pensylvanica (swamp saxifrage) Saxifragaceae (5 5 10 2 peri) 213 -- green or greenish; BT broad lance; hairy fl stalk

Saxifraga virginiensis (early saxifrage) Saxifragaceae (5 5 10 2 peri) 214 -- white; BT egg; hairy fl stalk

Saxifragaceae (saxifrage) -- Chrysoplenium, Heuchera, Mitella, Parnassia, Penthorum, Saxifraga, Tiarella

Scabiosa atropurpurea Dipsacaceae ((5) (5) 4 1) 488 --

Scabiosa columbaria Dipsacaceae ((5) (5) 4 1) 488 --

Scandix pecten-veneris Apiaceae (5 5 5 2) 348 --

Scheuchzeria palustris (pod grass) Scheuchzeriaceae (3 3 6 ? hypo; us anemophilous) 607 --

Schizachne purpurascens Poaceae 709 --

Schizachyrium scoparium (little bluestem grass) Poaceae 775

Schizaea pusilla (curly grass fern) Schizaeaceae 011

Schwalbea americana (chafseed) Scrophulariaceae ((5) (5) 4 1 hypo) 456 --

Scilla nonscripta (English bluebell) Liliaceae (3 3 6 3) 786 -- 6-12 blue to white fls; becoming campanulate

Scilla siberica (Siberian bluebell) Liliaceae (3 3 6 3) 786 -- c. 3 deep blue fls

Scirpus acutus (hard stem bulrush) 633 -- infl at top; spikelets dull gray-brown; stem hard (see S. validus)

Scirpus americanus (Olney three-square bulrush) 632 -- side infl; thick stem (see S pungens)

Scirpus atrovirens (dark-green bulrush) 634

Scirpus clintonii (Clinton' bulrush) 631 -- solitary, terminal spikelet; dry woods

Scirpus cyperinus (wool grass bulrush) 637 --

Scirpus fluviatilis (river bulrush) 634 --

Scirpus heterochaetus (slender bulrush) 633 --

Scirpus longii (Long's bulrush) 635 --

Scirpus maritimus (salt marsh bulrush) 634 --

Scirpus microcarpus (small-fruited bulrush) 636 --

Scirpus pendulus (pendulous bulrush) 636 --

Scirpus polyphyllus (many-leaved bulrush) 635 --

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