SESLANIA—SIUM. 
139 
SESLANIA, 16—10. ( Legznninosce .) 
vesica'ria, (y. An.) leaves pinnate; leafets oblong, obtuse, glabrous ; racemes 
shorter than the leaves. 5-7 f. S. 
SESUVIUM. 11—5. ( Ficoideae .) 
sessi'le , (r. Ju.) flowers sessile ; leaves linear-oblong, flat. Stem succulent. 
Sea-coast. 
SEYMERIA. 13—2. ( Scrophularice .) 
tenuifo'lia , (y-p. Au. <v}.) glabrous, very branching; leaves compound-pinna- 
tifid; segments Aliform, opposite and alternate ; corolla subrotate. 3-4 f. jS. 
pectina'ia , leaves pectinate-pinnatifld. 
SICYOS. 19—15. ( Cucurbitacece .) [From the Greek sikuos, a cucumber.] 
angula'ta , (single-seed cucumber, w. @.) leaves cordate, back lobes obtuse. 
5 -angled, scabrous, denticulate; tendrils umbellate ; steril flowers corymb¬ 
ose-capitate, with the common peduncle long; fertile flowers sessile ; fruit 
small, ovate, hispid. 
SIDA. 15—12. (Malvaceae,.) [Origin of the name doubtful.] 
abu'tilon , (Indian mallows, y. Ju. ©*.) leaves round-cordate, acuminate, tooth¬ 
ed, tomentose; peduncles solitary, shorter than the petioles; capsule 2 -awn- 
ed, truncate. 4-6 f. 
SILENE. 10—3. ( Caryophyllece .) 
yennsylva'nica , (pink-catchfly, p. M. J. 7j_.) viscidly pubescent; radical leaves 
wedge-form ; stem leaves lanceolate; panicles trichotomous ; petals slightly 
emarginate, very obtuse, sub-crenate. 8-12 i. 
virgin'ica , (r. J. %.) erect, or decumbent; viscidly pubescent; leaves lance- 
oblong, scabrous on the margin; panicle dichotomous; petals bifid; stamens 
exsert. 12 i. 
antirrhi'na , branches and peduncles very erect; calyx broad-oval, shining; blos¬ 
soms nocturnal; corolla small, whitish. Dry hills. 
injla'ta , calyx bladder-like, and beautifully veined; flowers white, petals bifid. 
Bladder campion. Rocky hills. Ex. 
arme'ria , (w-r. Au. #.) flowers fascicled, fastigiate ; upper leaves cordate, 
glabrous ; petals entire. Ex. 
co'nica , calyx of the fruit conic, striate. Ex. 
dichot'oma,, racemes in pairs, terminal, 1 -sided; flowers intermediate, pedun- 
cled. Ex. 
SILPHIUM. 17—4. ( Corymbifercc .) 
per folia'turn, (ragged-cup, y. Au. fij..) stem 4-angled, smooth, leaves opposite, 
connate, ovate, serrate. 6 f. Rays 24. Mountains. 
trifolia'tum , leaves verticillate by threes; panicle trichotomous; stem 4-6 f. 
high, mostly purple ; ray florets about 14, long, bright yellow. 
SINAPIS. 14—2. (Crucifer an.) 
ni'gra , (common mustard, y. J. <v).) silique glabrous, 4-angled, close pressed 
to the stem; leaves at the top lance-linear, entire, smooth. Naturalized. 
al"ba , (white mustard,) pod mostly hispid, spreading; flowers corymbose. 1-2 
feet. Introduced. 
SYSYMBRIUM. 14—2. (Crucifer cb.) [From sisubos, fringe ; so called from its fringed roots.] 
offcin"ale ) (y. Ju. 0.) leaves runcinate, hairy; flowers in a long raceme ; pod 
subulate. 1-2 f. Stem hairy, branched. Road-sides. 
SISYRINCHIUM. 15—3. ( Iridece .) 
an"ceps, (blue-eyed grass, b. J. 94--) scape or culm simple, 2-edged or 2-winged 5 
glume-like spatha of 2 unequal valves, extending above the flower ; petals, 
mucronate. Hedge-mustard. 6-12 i, 
mucruna'tum , scape simple, winged ; spatha coloured, one of the valves end¬ 
ing in a long, rigid point; stem setaceous, 6-10 i. Flowers 3-4 in a .spatha, 
blue. 
SIUM. 5—2. ( Umbelliferce .) [Fromsefo, to move ; from its agitation in the water.] 
latifo'lium , (water-parsnip, w. Ju. 7J-.) root creeping; stem erect, angular; 
leaves pinnate; leafets ovate, lanceolate, sessile, smooth, serrate, sometimes 
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