112. Lentibulariaceae 207 



4. Spikes ellipsoid; leaves lanceolate; seeds 2, hollowed on 

 the inner surface; waste places, roadsides, fields, lawns, 

 very common: nat. from Eur. May-Sept. Buckhorn 



Plantain P. lanccolata L. 



3. Leaves, or some of them, cordate at base; veins branching 

 from the midrib; spikes cylindrical; scapes hollow; capsules 

 2- to 4-seeded, 4-5 mm long; along ditches, rare. May- 

 July. Heart-leaved Plantain P. cordata Lam. 



2. Leaves linear. 



8. Bracts conspicuously longer than the flowers, linear; leaves 

 3-8 mm wide; capsules 2-seeded; fields, roadsides, and 

 open woods, common throughout 111. June-Aug. Bractcd 



Plantain P. aristata Michx. 



8. Bracts inconspicuous; leaves 1-4 mm wide. 



9. Spikes densely tomentose, cylindrical, obtuse, 3-12 cm 

 long, 5-8 mm thick; capsules 2-seeded; sandy soil in 

 fields and along roads in the northern half of the state. 



May-Aug P. purshii R. & S. 



9. Spikes glabrous, linear, 2-8 cm long, 3-4 mm thick; leaves 



linear-filiform. 



10. Capsules 4-seeded, less than twice as long as the calyx; 



leaves mostly entire; fields, roadsides, and open woods; 



chiefly in the southern part of the state, northward to 



Hancock and Champaign counties. Apr. -May 



P. pusilla Nutt. 



10. Capsules 7- to 30-seeded, about twice the length of 

 the caly.x; leaves often with several small teeth or 



linear lobes; sandy soil; Union Co. May 



P. heterophylla Nutt. 



1. Leaves opposite or whorled, linear, sessile, pubescent, the leafy 

 stem 15-45 cm tall; flowers in capitate spikes; capsules 2- 

 seeded; waste ground, occasional; adv. from Eurasia; known 

 from Champaign, Cook, Lake, McHemy, and Winnebago 



counties. July-Sept. [P. arenaria Waldst. & Kit.] 



P. iudica L. 



112. Lentibulariaceae Lindl. — Bladderwort Family 



1. Utricularia L. — Bladderwort 



Pedicels recurved in fiiiit. 



2. Flowers 1-2 cm long, the spur conspicuous, slightly curved 

 upward; ponds and slow streams, chiefly in the northern 

 half of the state. July-Aug. [U. vulgaris var. americana A. 

 Gray; U. macrorhiza LeConte] U. vulgaris L. 



2. Flowers 4-6 mm long; spur short, blunt, almost obsolete; lake 

 shores or stagnant water; Lake Co., Hill; Ringwood, Mc- 

 Henry Co., Vasey U. minor L. 



