86 American Midland Naturalist Monograph No. 2 



12. Mature leaves 3-5 mm. wide; dry woods, in the n. part 



of the state, flowering in early spring 



C. communis Bailey 



12. Mature leaves 1-2.5 mm. wide; dry woods, flowering in 

 early spring. [C. yaria of Muhl., not Lumn., or 



Host] C. artitecta Mack. 



10. Pistillate spikes 1-7 cm. long. 



13. Leaves involute, 1-2 mm. wide; swamps and bogs, n. III. 



C. lasiocarpa Ehrh. 



13. Leaves flat, 2-6 mm. wide. 



14. Perigynia 2.5-3.5 mm. long, the beak 1 mm. long; pistil- 

 late spikes 5-8 mm. thick; style straight, jointed with 

 the achene; swamps, chiefly in the n. and centr. parts 



of the state C. lanuginosa Michx. 



14. Perigynium 5 mm. long, the beak 1.5 mm. long; pistil- 

 late spikes 8-12 mm. thick; style flexuous, continuous 

 with the achene; ditches and moist woods; Macon 



Co., Clokey 2338 (type collection) 



C. subimpressa Clokey 



24. Araceae Necker — Arum Family 



1. Leases with 3-1 I leaflets; spathe conspicuous, convolute at least below, enveloping 

 the cylindrical or slightly flattened spadix which is flower-bearing near the base; 



flowers monoecious or dioecious, without perianth; plant cormose 1. Arisaema 



1. Leaves simple, or absent at flowering time. 



2. Leaves sagittate or cordate, or absent; spadix terminal. 



3. Spathe ovoid, fleshy, greenish or yellowish, purple-mottled; spadix globose, cov- 

 ered by the perfect flowers; perianth of 4 hooded sepals; leaves appearing 

 later, large, ovate, cordate; plant with a very fetid odor 2. Syimplocarpiis 



3. Spathe narrow, elongate, convolute, green; spadix cylindrical, bearing sfaminate 



flowers above and pistillate below; perianth none; leaves sagittate... .3. PeZ/a/n/ra 



2. Leaves linear, erect, equitanl; spathe merely a foliaceous prolongation of the scape; 



spadix cylindrical, borne laterally on the leaf-like, 3-angled scape; perianth with 



6 membranous concave divisions; rhizomes and leaves aromatic 4. Acorus 



1. Arisaema Mart. 

 1. Leaflets 3; spadix terete, club-shaped, obtuse, overarched by the green or 

 purpled-striped spathe; moist woods, common. Apr.-May. Jack-in-the- 



Pulpit. Indian Turnip. [A. triphyllum sensu auth., not Schott} 



A . atrorubens (Ait.) Blume 



1. Leaflets 7-11; spadix slender, projecting beyond the green spathe; moist 

 woods, common. May-June. Green Dragon. Dragonroot [Mur'tcauda 

 dracontium (L.) Small} A. dracontium (L.) Schott 



2. Symplocarpus Salisb. — Skunk-cabbage 

 {Spalhyema Raf.) 

 S. joetidus (L.) Nutt. Swamps, local; chiefly in n.e. and centr. 111., ex- 

 tending southw. to Jasper Co.; apparently absent from the w. and s. counties 

 Feb.-Apr. 



