Jones: Flora of Illinois, 134. Verbenaceae 215 



4. Corolla-lobes erose-denticulate, the tube 1.5-3 cm. long; later flowers 

 cleistogamous, smaller; leaves linear; prairie soil, chiefly in n.e. III., 

 but extending southw. along the valley of the Illinois R. May-July. 



[L. incisum Lehm.; L. linear ijolium Goldie} 



L. angustifolium Michx. 



4. Corolla-lobes entire, the tube less than 1.5 cm. long; flowers all com- 

 plete; leaves lanceolate. 

 5. Stems and leaves hispid-pubescent; corolla light yellow, pubescent 

 within at base; nutlets 3.5-4 mm. long; sandy soil. May-July. [L. 



gmelini and L. carolinense of auth.} L. croceum Fern. 



5. Stems and leaves soft-pubescent; corolla orange yellow, glabrous 



within; nutlets 2.5-3 mm. long; sandy soil. Apr. -June 



L. canescens (Michx.) Lehm. 



1. Annual; corolla white; nutlets gray, wrinkled and pitted; waste places and 

 fields; nat. from Eur. May-Aug L. arvense L. 



7. Onosmodium Michx. — False Gromwell 

 1. Leaves and stems shaggy-pubescent; stems 90-120 cm. tall; nutlets with a 

 slight constriction or rim at base; dry banks and fields, local. June-July 



O. hispidissimum Mack. 



1. Leaves and stems grayish-pubescent with mostly appressed hairs; stems 40-60 

 cm. tall; nutlets rounded at base, not at all constricted; hillsides, bluffs, 

 and thickets, w. 111., local. June-July O. occldentale Mack. 



8. Symphytum L. — Comfrey 

 S. officinale L. Roadsides and waste places, occasional; introd. from Eur. 

 Urbana, Champaign Co., Waite; Algonquin, McHenry Co., Nason. 



9. EcHiuM L. 

 E. vulgare L. Blueweed. Waste places, roadsides, and fields; nat. from 

 Eur. June-Aug. 



134. Verbenaceae J. St. Hil. — Verbena Family 



1. Corolla 5-lobed. nearly regular; calyx tubular; fruit splitting into 4 nutlets 



I . Verbena 



1. Corolla 4-lobecl and 2-lipped; calyx short, 2-cleft; fruit splitting into 2 nutlets.. 



2. P/ip/a 



1. Verbena L. — Vervain 

 1. Flowers 1.5-2.5 cm. long; bracts shorter than the calyx; leaves incisely lobed 

 or toothed; open woods, occasional. Menard Co., and southw. May-Aug. 



V. canadensis (L.) Britt. 



1. Flowers 4-10 mm. long. 



2. Bracts longer than the flowers; stems decumbent, hirsute; roadsides and 



waste places. June-Sept. [V. bracteosa Michx.} 



V. bracteata Lag. & Rodr. 



2. Bracts shorter than the flowers; stem erect; spikes slender or filiform. 

 3. Corolla white; spikes filiform; calyx in fruit 2 mm. or less in length; 

 leaves serrate; roadsides and open woods, common. [V . urticaefolia 



