

FLORA OF THE DISTRICT OF COLUMBIA. 251 



8. MIMULUS L. Monkey flower. 



Leaves sessile; pedicels longer than the calyx 1. M - ringens. 



Leaves petioled ; pedicels shorter than the calyx 2- M. alatus. 



1. Mimulus ringens L. 



Swamps and along streams; frequent. July-Aug. Eastern N. Amer. 



2. Mimulus alatus Soland. 



Swamps and along streams; frequent. July-Aug. Eastern U. S. 



Mazus japonicus (Thunb.) Kuntze, a small annual with blue flowers, native of 

 Asia, was collected in the Department of Agriculture grounds in 1895 and 1896. 

 9. MECARDONIA Ruiz & Pav. 



1. Mecardonia acuminata (Walt.) Small. Water hyssop. 



Low ground along the Potomac; infrequent. July-Sept. Southeastern U. b. 

 (Eerpestis nigrescent Benth.; Bacopa acuminata Robinson.) 



10. GRATIOLA L. Hedge hyssop. 



Capsule globose, as long as the pedicel; plants glabrous or nearly so. 



1. G. virginiana. 



Capsule ovoid, much shorter than the pedicel; plants finely glandular-hairy. 

 Leaves lanceolate, mostly 2.5-5 cm. long; stems usually branched; capsule equaling 



or slightly longer than the sepals 2 - G - » e g lecta - 



Leaves broadly ovate, mostly 1 cm. long or shorter; stems usually simple; capsule 



shorter than the sepals 3 - G ' vlscosa - 



1. Gratiola virginiana L. 



Wet soil; occasional. May. Southeastern U. S. and Mex. (G. sphaerocarpa Ell.) 



2. Gratiola neglecta Torr. ,_..-. 

 Wet soil; occasional. May-June. Widely distributed in N. Amer. (G. virginiana 



of authors.) . 



G. aurea Muhl. has been reported from our region, but no specimens have been 



seen by the writer. 



3. Gratiola viscosa Schwein. 



Swamps along the Eastern Branch and Hunting Creek. Aug.-Sept. Southeastern 



IT S 



11. SOPHRONANTHE Benth. 



1. Sophronanthe pilosa (Michx.) Small. 



Dry or wet soil, north and east of Washington; occasional. July-Aug. South- 

 eastern IT. S. (Gratiola pilosa Michx.) 



12. ILYSANTHES Raf. False pimpernel. 



Pedicels longer than the leaves; calyx lobes shorter than the capsule 1. I. dubia. 



Pedicels shorter than the leaves; calyx lobes as long as the capsule or longer. 



2. I. attenuata. 



1. Ilysanthes dubia (L.) Barnhart. 



Wet soil along the Potomac; rare. July-Aug. Eastern U. S. (I. gratioloides 



Benth.) 



2. Ilysanthes attenuata (Muhl.) Small. 



Wet soil along the Potomac and Patuxent; frequent. July-Sept. Eastern N . 

 Amer. (I. gratioloides of Ward's Flora, in part.) 



13. MICRANTHEMTJM Michx. 



1 Micranthemum micranthemoides (Nutt.) Wettst. 



In mud along the Potomac and Hunting Creek. Sept. Southeastern U. S. (M. 

 nuUallii A. Gray.) 



