242 BOEAGINACEAE. 



2. M. arvensis (L.) Willd. Steins 1-3 dm. tall: leaf -blades spatulate to 

 oblong or oblong-lanceolate, 1-5 cm. long: calyx becoming 3-4 mm. long; 

 lobes equal or nearly so: corolla blue or sometimes white; lobes over -J as long 

 as the tube : nutlets about 1.5 mm. long. S. Bare, in low grounds. Schists. 



3. M. virginica (L.) B.S.P. Stems 1-4 dm. tall: leaf -blades similar to those 

 of M. arvensis, 1-3 cm. long: pedicels 1-3 mm. long: calyx becoming 6-7 mm. 

 long; lobes slightly unequal: corolla white; lobes less than as long as the 

 tube: nutlets about 1.5 mm. long. Common, on dry hills and in fields. 



5. LITHOSPEBMUM [Tourn.] L. Annual, biennial, or perennial herbs. 

 Calyx slightly enlarged at maturity. Corolla slightly longer than the calyx, 

 white, greenish, or yellowish. Style as long as the ovary or somewhat longer. 

 Fruit surpassed by the calyx. Spr. and sum. GROMWELL. 



Annual or biennial plants : corolla white or whitish, slightly surpassing the calyx, 

 not appendaged in the throat : nutlets dull. 



1. L. arvense. 



Perennial plants : corolla pale yellow or yellow-white, surpass- 

 ing the calyx, appendaged in the throat : nutlets shining. 2. L. latifoUum. 



1. L. arvense L. Stems and branches 1-8 dm. long: leaf -blades linear- 

 oblanceolate to linear-lanceolate, 1.5-5 cm. long, acutish: calyx-lobes narrowly 

 linear to linear-subulate, 8-10 mm. long, revolute: corolla white or pinkish; 

 lobes | as long as the tube: nutlets about 3 mm. long, pitted and wrinkled. 



Common, in fields and on dry hills. CORN-GROMWELL. 



2. L. latifolium Michx. Stem and branches 3-7 dm. tall: blades of the cauline 

 leaves elliptic to elliptic-lanceolate, 4-12 cm. long, acuminate: calyx-lobes 

 narrowly linear, becoming 8-10 mm. long, flat: corolla yellow-white or pale- 

 yellow; lobes over as long as the tube: nutlets ovoid, 3-3.5 mm. long, smooth. 



M. Bare, in fields and on roadsides. 



6. BATSCHIA G. F. Gmel. Perennial herbs, with colored roots. Calyx 

 nearly unchanged at maturity. Corolla much longer than the calyx (except in 

 cleistogamous flowers), yellow. Style many times longer than the ovary. 

 Fruit surpassed by the calyx, the nutlets mainly ovoid. 



1. B. canescens Michx. Plants 1-4 dm. tall: leaf -blades linear to oblong or 

 ovate-oblong, 9-21 mm. long: calyx-lobes linear or nearly so, becoming 3-5 

 mm. long: corolla orange-yellow; tube 9-11 mm. long: nutlets about 2.5 mm. 

 long. W. Frequent, in woods. Nat. of the West. Sandstones and shales. 

 Sum. PUCCOON. 



7. ONOSMODIUM Michx. Perennial herbs with hard roots. Sepals nearly 

 distinct. Corolla much longer than the calyx, without appendages in the 

 throat, the lobes relatively long. 



1. O. virginianum (L.) DC. Stems strigose-hispid, 2-7 dm. tall: leaf -blades 

 oblong to linear-oblong or linear-lanceolate, 2.5-12 cm. long, obtuse or acutish: 

 calyx-lobes narrowly linear-lanceolate, becoming 6-8 mm. long: corolla yel- 

 lowish, 8-10 mm. long; lobes subulate-lanceolate, somewhat shorter than the 

 tube : nutlets about 3 mm. long. Common, in thickets and open woods. 

 Sum. FALSE-GROMWELL. 



8. SYMPHYTUM L. Perennial herbs with mucilaginous roots. Sepals 

 manifestly united into a tube. Corolla much longer than the calyx, with long 

 appendages in the throat, the lobes relatively short. 



1. S. officinale L. Stems and branches 3-10 dm. tall, hirsute: leaf -blades ob- 

 long, lanceolate, or ovate-lanceolate, or sometimes ovate, 8-30 cm. long: calyx- 



