Spiraea alba (narrow-leaved meadowsweet) -- white; AT lance-,finely toothed

Spiraea alba var. latifolia (meadowsweet) 219 -- white or pale pink; AT broad lanceolate

Spiraea japonica (Japanese spiraea) 218 -- mostly pink fls.; AT

Spiraea sp. (spiraea) Rosaceae (5 5 N 1) --

Spiraea tomentosa (steeplebush) 219 -- rose-pink; lvs tomentose beneath; AT Spiranthes casei (ladies' tresses) 816 --

Spiranthes cernua (nodding ladies' tresses) 815-- nodding fls; smwhat yellowish-green in center; blooms late sum & fall

Spiranthes lacera (slender ladies' tresses) 816 -- central green spot; one-sided spike; basal rosette only

Spiranthes laciniata (lace-lipped ladies' tresses) 817 -- fl w/ yellowish center; part of infl like twisted rope; coastal plain

Spiranthes praecox (giant ladies' tresses) 817 -- lip w/ green veins; coastal plain

Spiranthes romanzoffiana (hooded ladies' tresses) 815 -- swamps, bogs & wet shores; blooms midsummer

Spiranthes sp. (ladies' tresses) Orchidaceae (2+1z 3 1-2 3) --

Spiranthes tuberosa (little ladies' tresses) 816 -- pure wh fls, one sided spike; basal rosette only; acid, us rather dry soil

Spiranthes vernalis (grass-leaved ladies' tresses) 816 -- more yellowish centrally, one sided spike Spirodela polyrhiza Lemnaceae (0 0 1 0/0 0 0 1) 616 -- 5-12 roots; frond br oval to obovate; anthocyanic beneath; thallus many-nerved Spirodella punctata -- thallus not many-nerved

Sporobolus asper (tall dropseed grass) Poaceae 741 -- pipe cleaners, partly hidden inside sheath; single papery fl

Sporobolus clandestinus (rough dropseed grass) Poaceae 742 --

Sporobolus contractus (contracted dropseed grass) Poaceae 742

Sporobolus cryptandrus (sand dropseed grass) Poaceae 741 -- ligule very hairy

Sporobolus heterolepis (prairie dropseed grass) Poaceae 743 -- prple to blk infl, thin branches; papery blackish scales around big round seed

Sporobolus indicus (smut dropseed grass) Poaceae 742 -- very long pipe cleaner

Sporobolus neglectus (neglected dropseed grass) Poaceae 743 --

Sporobolus pyramidatus (pyramidal dropseed grass) Poaceae 741

Sporobolus vaginiflorus (poverty dropseed grass) Poaceae 743 -- infl partly covered by sheath; scraggly tufts

Stachys annua (hedge nettle) 427 -- fls pale yellow to white

Stachys arvensis (hedge nettle) 427 -- fls anthocyanic to white

Stachys aspera (hedge nettle) 425 --

Stachys byzantina (Byzantine hedge nettle) 425 -- fls red; herbage densely & softly white-woolly

Stachys germanica (German hedge nettle) 425 -- fls pink or purple; herbage densely & softly white-woolly

Stachys hispida (hispid hedge nettle) 425 -- cal lobes hirsuite

Stachys hyssopifolia (hyssop hedge nettle) 425 -- pale purple; lvs OE

Stachys palustris (marsh hedge nettle) 425 -- fls purplish-white maculate; OT lance, short stalked; stem hairy

Stachys sp. (hedge nettle) Lamiaceae ((5) (5) 2+2 1) --

Stachys tenuifolia (thin-leaved hedge nettle) 425 -- rose-purple; OT lance, w/ definite petioles Staphylea trifolia (bladdernut) Staphyleaceae 330 --

Stellaria alsine (bog stitchwort) 104 -- pets shorter than seps

Stellaria aquatica (giant chickweed) Caryophyllaceae (5 5 10 5) 103 -- styles 5; lvs elliptical

Stellaria borealis (northern stitchwort) 104 -- fls us. Solitary, pets shorter than seps, broad lance

Stellaria graminea (lesser stitchwort) 104 -- OE linear, broadest near base, short; infl open

Stellaria holostea (easter bell chickweed) 103 -- bracts herbaceous; lvs lanceolate

Stellaria longifolia (long-leaved stitchwort) 104 -- OE long, linear, broadest near middle; infl open

Stellaria longipes (long-stalked stitchwort) 104 --infl less open

Stellaria media (common chickweed) 103 -- OE lvs spade-like & petioled

Stellaria pubera (star chickweed) 103 -- fls 1/2"; OE elliptic sessile, petioled

Stellaria sp. (chickweed) Caryophyllaceae (5 5 10 3) Strophostyles helvula (annual woolly bean) Fabaceae (5 5 10 1 perf or unisex; peri) 285

Strophostyles umbellata (perennial wild bean) Fabaceae (5 5 10 1 perf or unisex; peri) 286 --

Stylisma humistrata Convolvulaceae ((5) 5 5 1) 384 --

Stylisma pickeringii (Pickering's morning glory) Convolvulaceae ((5) 5 5 1) 384 --

Stylosanthes biflora (pencil flower) Fabaceae (5 5 10 1 perf or unisex; peri) 263 -- yellow; AD tri, lance/ellip & bristle-tipped

Styrax americanus (American snowbell) Styracaceae ((5) (5) 10 1 hypo to epi) 198

Styrax grandifolius (big leaf snowbell) Styracaceae ((5) (5) 10 1 hypo to epi) 198 --

Suaeda americana (northeastern seablite) Chenopodiaceae (0 5 5 2+ perf or unisex) 093 --

Suaeda linearis (southern seablite) Chenopodiaceae (0 5 5 2+perf or unisex) 093 -- plant erect; lvs deep green

Suaeda maritima (white seablite) Chenopodiaceae (0 5 5 2+perf or unisex) 093 -- plant low & spreading; lvs pale grn us whitened

Suaeda sp. (Seablite) Chenopodiaceae (0 5 5 2+perf or unisex) 093 -- axillary grn fls; AE flat on 1 side, round on other

Subularia aquatica Brassicaceae (4 4 4+2 1) 167

Succisella inflexa (devil's bit) Dipsacaceae ((4) (4) 4 1) 489 --

Symphoricarpos albus (snowberry) Caprifoliaceae ((5) 5 5 1 half to wholly inf) 481 --

Symphoricarpos orbiculatus (coralberry) Caprifoliaceae ((5) 5 5 1 half to wholly inf) 481 --

Symphytum officinale (common comfrey) Boraginaceae ((5) (5) 5 1 hypo)402--yellowish, whitish or purple fls, in uncoiling 1-sided racemes; AE lance or egg

Symphytum tuberosum (tuberous comfrey) Boraginaceae ((5) (5) 5 1 hypo) 402 -- Symplocarpus foetidus (skunk cabbage) Araceae (spathe & spadix) 615 -- spathe is purple brown and green mottled; NONE

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