M'lC) LKMXACE.K. (lH'CK WI-KIi I \:MII.V.) 



thick and Hcsliy. — rcrcimiiil pailic-scontoil licrlis, fnim a deop ami tliiik 

 rlii/.diiia, witli largo st(>m-j)Ctinl('{| veiny leaves, and nearly sessile s])allies, ap- 

 ]M aring before tiie leaves. 



1. S. fOBtidus, Salisl). Leaves thin, (ival, cordate, sliortjjetiolcd ; sj)athe 

 ovate, iiuiuvcd, s]K)tled with jmrple and yellow; spadix dull purjde, much 

 sliorter liian tlie sjiatlie, enlarged in fruit. — Bogs and swamps. North Caro- 

 lina, and northward. Feh. - Marcli. — Leaves l°-2''long. Spathc 2'-4' 

 long. Spadix in fruit 2' -.'3' in dianicti-r. Seeds ahoiit tiie size of a jiea. 



5. ORONTIUM, L. Goi.uen-Ci.i h. 



Spathe none. Spadix rylindrical, covered with the yellow perfect flowers. 

 Sepals and stamens 4-0. Anthers 2-celled, opening lengthwise. Ovary I - 

 celled, with a single amphitropous ovule. Stigma minute, sessile. Fruit 

 green. Seed without allnimen. Endiryo tln'ck and fleshy. — A perennial 

 a(|uatic herl), witli ohlong long-petioled leaves, and a yellow erect spadix ter- 

 minating the cluh-sha])ed scape. 



1. O. aquaticum, L. Ehizoma deep, fleshy; leaves acute, nerved, on 

 stout terete petioles ; scape terete, thickened upward, white beneath the spadix, 

 sheathed below, commonly curved. — Ponds and slow-flowing streams. 

 March -April. — Leaves about 1° long. Scape l°-2° long. Spadix \'-2' 

 long ; the upper flowers mostly tetrandrous. 



6, ACORUS, L. Cal.vmus, Sweet Flag. 



Scape flattened, leaf-like, with the lateral sessile spadix covered with the 

 perfect flowers. Spathe none. Sepals and stamens 6. Corolla none. Fila- 

 ments slender: anthers kidney-shaped, 1-celled, opening transversely. Ovary 

 2-.3-celled, with several orthotropous suspended ovules in each cell. Stigma 

 minute. Fruit dry, gelatinous within, 1 -few-seeded. Embryo in the axis of 

 the albumen. — Perennial herbs, from a creeping aromatic rhizoma. Leaves 

 erect, long, flattened, 2-edged. Scajje leaf-like, elongated above the spadix. 



1. A. Calamus, L. — Wet places, apparently introduced. April. — 

 Rhizoma rather slender, pungent. Leaves l°-2° high, linear-lanceolate. 

 Scape narrower than the leaves. Spadix cylindrical, yellowish, 2'-3'' long, 

 spreading. 



Order 138. LEMNACE^^. (Duckweed Family.) 



]\linute aquatic floating plants, with lenticular proliferoiis stems 

 (fi-onds), and usually simple roots, pendent from heneafh. Flowers 

 monrpcious, mostly from a marginal cleft of the stem. Spathe mem- 

 branaceous, pitclier-shaped, bursting into two ujiequal lobes, soon A-an- 

 Lsliiiig, commonly enclosing two sterile flowers, which are reduced to 

 single slender filaments bearing a 2-celled anther, and a single sessile 

 1-colled ovary, -which forms in fruit a 1 -7-seeded utricle. Embryo 

 straight, in the axis of fleshy albumen. 



