1. A. Curtísii, Buckley. Glabrous; leaves twice ternate or the divisions quinate; leaflets thin, ovate-lanceolate (1–3´ broad), sharply and irregularly toothed; fruit glabrous, 1½–3´´ broad; oil-tubes mostly one in the intervals (sometimes 2 or 3).—Along the Alleghanies from Penn. to N. C. Aug.
2. A. hirsùta, Muhl. Pubescent above; leaves twice pinnately or ternately divided; leaflets thickish, lanceolate to oblong (5–10´´ broad), serrate; fruit pubescent, 2´´ broad; oil-tubes 3–6 in the intervals. (Archangelica hirsuta, Torr. & Gray.)—Dry ground, Conn. to Minn., Tenn., and Fla. July.
[*][*] Seed loose; oil-tubes indefinite (25–30); upper petioles not so prominent.
3. A. atropurpùrea, L. Very stout, glabrous throughout, with dark purple stem; leaves 2–3-ternately divided, the pinnate segments of 5–7 lanceolate to ovate leaflets (1–1½´ broad), sharply mucronate-serrate. (Archangelica atropurpurea, Hoffm.)—River-banks, Lab. to Del., Ill. and Minn. June.
4. CONIOSELÌNUM, Fisch. Hemlock-Parsley.
Calyx-teeth obsolete. Stylopodium slightly conical. Fruit oval, flattened dorsally, glabrous, the dorsal ribs very prominent, the lateral ones extended into broad wings; oil-tubes 1–4 in the intervals, 4–8 on the commissure; seed slightly concave on the inner face.—Tall slender glabrous perennial, with finely 2–3-pinnately compound leaves, few-leaved involucre or none, involucels of elongated linear-setaceous bractlets, and white flowers. (Compounded of Conium and Selinum, from its resemblance to these genera.)
1. C. Canadénse, Torr. & Gray. Leaflets pinnatifid; wings nearly as broad as the seed; oil-tubes 2–3 in the intervals, sometimes 1 or 4.—Swamps and cold cliffs, from Maine to Minn., southward to N. C. (in the higher mountains), Ind., Ill., and Mo. Aug.–Oct.
5. TIEDEMÁNNIA, DC.
Calyx-teeth evident. Fruit ovate to obovate, flattened dorsally; dorsal ribs filiform, the lateral broadly winged, closely contiguous and strongly nerved next to the body (giving the appearance of 5 dorsal ribs); oil-tubes solitary in the intervals, 2–6 on the commissure; stylopodium short, thick-conical.—Glabrous erect aquatic herbs, with leaves reduced to petioles or of few narrow leaflets; involucre and involucels present, and flowers white. (Dedicated to the anatomist Prof. Tiedemann, of Heidelberg.)
1. T. teretifòlia, DC. Stem hollow, 2–6° high; leaves reduced to cylindrical hollow pointed nodose petioles; oil-tubes filling the intervals.—Ponds and swamps, Del. to Fla., and west to La. Aug., Sept.