ZiziA. LXVII. UMBELLIFERiE. 287 



to Can. Stem 3 — 4f high, round, striate, hollow, green, branching. Leaves 

 various, those ol" the stem generally bilernale, of the branches ternate. Leaf- 

 lets or segments 2 — 1' long, 1 — l" wide, linear or lance-linear, smooth, with 

 slender teeth. Bulblets ul'icn numt-rous, opposite, and within the axils of the 

 bracteate petioles. Umbels terminal. Involucre 0. Umbellets of close, small, 

 white flowers, and slight involucels. Aug. 



8. SIUM. 



Celtic she, wafer ; that is, a genus of U'luatic plants. 



Calyx margin r)-toothed or obsolete ; petals obcordate, with an in- 

 flexed point ; fruit nearly oval ; carpels with 5 obtusish ribs, and 

 several vittae in each interval ; carpophore 2-parted. — % Aquatic. 

 Lvs. pitniately div'uled. Umbels perfect^ ivilh partial aiid general many- 

 leaved invoUcra. Fls. white. 



1. S. LATiroLiUM. Water Parsncp. 



(S^. angular, sulcate; Ifts. oblong- lanceolate, acutely serrate, acuminate ; 

 cal. teeth elongated. — A taU plant in swamps and ditches, N. J. tola. ! and Can. 

 Stem about 3f liigh, smooth, hollow, with 7 deep-furrowed and prominent an- 

 gles. Leaflets or segments 4 — 6' long, 1 — 2' broad, equally serrate, in about 4 

 pairs, with an odd one, those submerged, if any, pinnatitid. Petioles embrac- 

 ing the stem. Umbels large, with many-flowered rays. Flowers small, white. 

 Jl. Aug. 



2. S. LiNEARE. Michx. (S. latifolium, 0. Hneare. Bw.) 



St. angular, sulcate; Ifls. 9 — 11, linear and lance-linear, finely serrate, 

 acute ; cat teeth ob.solete. — More common than the last, in swamps, N. J. to 

 la. ! and Can. Stem 2 — 4f high, smooth, with 7 prominent angles. Leaflets 

 2 — 4' long, 2 — 4" (rarely 10") wide, the odd and lower ones petiolulate, middle 

 pairs sessile. Umbels H — 2h' broad. Involucre of 5 or 6 linear bracts, i as 

 long as the 15 — 21 rays. Umbellets with numerous, small, white flowers. 

 Fruit roundish, crowned with the broad, yellowish stylopodium. Jl. Aug. 



9. CRYPTOTiENIA. DC. 



Gr. Kpv-iTTO}, to conceal, raivia, a wreath or border; from the obsolete border of calyx. 



Margin of the calyx obsolete ; petals with an inflexed point ; fruit 

 linear-oblong or ovate-oblong ; ; carpels with 5 obtuse ribs ; carpo- 

 phore free, 2-parted ; vittas very narrow, twice as many as the ribs. 

 — % Lvs. o-parted, lobcd and toothed. Umbels compound., with very un- 

 equal rays. Invol. Q. Involucels feiv-leaved. Fls. lohite. 



C. Canadensis. DC. (Sison Canadense. Linn.) Hone-n'ort. 



Lvs. smooth ; Ifts. or segments rhomboid-ovate, distinct, entire or 2 — 3- 

 lobed, doubly serrate, lateral ones oblique at base; vmbcls numerous, irregular, 

 axillary and terminal.— Common in moist woods. Stem erect, 1 — 2f high. Lower 

 petioles 2 — G' long, clasping. Leaflets 3, 2—3' long, 1—2' wide, petiolulate. 

 Umbels paniculate, of 3—5 very unequal rays. Umbellets of 4—6 unequal 

 pedicels and minute involucels. Flowers small, white. Fruit near 3" long, 

 oblong-elliptic. Jl. 



10. ZIZIA. Koch. 

 Calyx margin obsolete or minutely toothed ; petals carinate, apex 

 acuminate, inflexed ; fruit roundish or oval, didymous ; carpels 5- 

 ribbed,^ lateral ribs marginal ; intervals with I — 3 vittjB, commis- 

 sure with 2 — 4 ; carpophore 2-parted ; seeds plano-convex. — % Lvs. 

 divided. Umbels perfect. Livol. 0. Livolucels few-leaved. Fls. yellow. 

 1. Z. aurea. Koch. (Smyrnium. Lin7i. Thaspium. Nutt. ?) Golden Alexanders. 

 Z/z*s. biternate ; //?.«;. oval-lanceolate, serrate; umbellets with short rays. — 

 Hills and meadows, U. S. and Can. Stems 1— 2f high, branching above, rather 

 slender, erect, hollow, angular-furrowed, smooth as well as every other part of 

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