118 CLASS V. ORDER II. 



side. Seeds oblong-hemispherical, three winged on the back. — 

 Cambridge, meadows. — June. 



The circumstance that the terminal leafet is sessile, never pe- 

 tioled, is evidence that this plant is not A. atropurpurea of 

 Linnaeus, as many of our botanists suppose. 



12S. LIGUSTICUM. 

 LiGusTicuM scoTicuM. L. Sctt Lovogc. 



Stem leaves twice teniate, the upper ones trifoliate; 

 umbels straight; involucre and involucels linear, 

 many leaved. 



Stem purple or green, flexuous, striated, a foot or two high and 

 larger than a goose quill. Petioles with large sheaths. Leaves 

 twice ternate ; the leafets sessile, and sometimes connected at 

 base, oval or rhomboidal, smooth, shining, veiny, and somewhat 

 fleshy. Umbels Avith general and partial involucres. Flowers 

 white. Fruit oblong-oval, separating into seeds which have 

 three strong ridges on the back. — On the borders of Charles 

 river, Cambridge, and other parts of the edge of salt marshes. — 

 August, September. — Pereuuial. 



LiGUSTICUM ACT^IFOLTUM. Ml'. Actdtt Icavccl LoVOgC. 



Leaves twice ternately cut, segments oval, equally 

 toothed ; umbels somewhat whorled, the lateral ones 

 barren. 

 Syn. Thapsium actjeifoliitm. De Cand. 



More than three feet high. Side leaves tripeziform, end leaves 

 rhomboidal. General and partial involucre linear, many leaved. 

 Umbels numerous. Fruit with ribs which are slightly winged. 

 — Topsfield and Scituate. — Mr. Oakes. Mr. Russell.— Perennial. 



129. SlUM. 

 SiUM LATiFOLiuM. L. Water Parsnep. 



Leaves pinnate; leafets oblong-lanceolate, equally 

 serrate, ^m. 



A tall aquatic plant common in ditches and muddy brooks. 

 Stem erect, hollow, smooth, with deep furrows, and sharp, prom- 



