298 American Midland Naturalist Monograph No. 7 



13. Tipularia Nutt. — Cranefly Orchid 



T. discolor (Pursh) Nutt. Deep mesophytic beech-maple woods, 

 rare. Jackson Hollow and Belle Smith Spring, Pope Co., R. H. 

 Mohlenbrock & J. W. Voigt in 1958. 



14. Corallorhiza Chat. — Coralroot 

 1. Lip with two prominent basal lobes, white, conspicuously crimson- 

 spotted; mature capsules 10-18 mm long; woods, rare; Cook, 

 Jo Daviess, La Salle, Peoria, and Winnebago counties. July- 



Aug. Spotted Coralroot C. maculata Raf. 



1. Lip entire or denticulate, or crenulate. 



2. Lip 4-5 mm long, entire or denticulate, white, with crimson 

 spots; mature capsules 6-7 mm long; moist woods, rare. 



Aug.-Oct. Late Coralroot C. odoutorhiza (Willd.) Nutt. 



2. Lip 5-7 mm long, crenulate, notched at apex, white, with purple 

 spots; mature capsules 9-11 mm long; woods in the southern 



half of 111. Apr. -May. Wister's Coralroot 



- C. wisteriana Conrad 



15. Hexalectris Raf. — Crested Coralroot 

 H. spicata (Walt.) Barnh. Woods, rare; Jackson, Pope, and Ran- 

 dolph comities. July-Aug. 



141. Araceae Necker — Arum Family 



1. Leaves with 3-11 leaflets; spathe conspicuous, convolute at least below, 

 enveloping the cylindrical or slightly flattened spadix which is flower- 

 bearing near the base; plants monoecious or dioecious; perianth none; 



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, covered by the perfect flowers; perianth of 4 hooded sepals; 

 leaves appearing later, large, ovate, cordate; plant with a very fetid 



odor 2. Symplocarpus 



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

 staminate flowers above and pistillate below; perianth none; leaves 



sagittate 3. Peltandra 



2. Leaves linear, erect, cquitant; 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. A corns 



1. Arisaema Mart. 



1. Leaflets usually 3; spadix terete, club-shaped, obtuse, overarched 



by the green or purple-striped spathe; moist woods, common. 



Apr. -May. Jack-in-the-pidpit. Indian Turnip. [A. atiorubens 



of some recent auth.] Smaller plants with the spathe dark 



purple (var. pusillum Peck) have been collected in s. Ill 



A. triphylliim (L.) Schott 



