FLORA OF THE DISTRICT OF COLUMBIA. 245 



2. Clinopodium nepeta (L.) Kuntze. Basil thyme. 



Dry waste places. June-Oct. Native of Eur. and Asia; naturalized in eastern N. 

 Amer. {Satiireja nepeta Scheele; Calamintha nepeta Link & Hoffm.) 



Origanum vulgare L., wild marjoram, has been collected a few times in waste places, 

 but is probably not established. July-Sept. Native of Eur. and Asia; naturalized 

 in eastern N. Amer. 



21. KOELLIA Moench. Bee mint. 



Leaves mostly ovate, at most two and one-half times as long as broad. 



Flower clusters less than 1.8 cm. thick; leaves rigid, minutely pubescent or glabrate, 



usually less than 5 cm. long 1. K. mutica. 



Flower clusters 2-5 cm. thick; leaves thin, white-woolly beneath, some of them 



7-10 cm. long 2. K. incana. 



Leaves lanceolate to linear, usually 3-7 times as long as broad or longer. 



Flower clusters in dense corymbs; leaves linear or linear-lanceolate. 



Calyx teeth slender, rigidly eubulate-tipped; leaves linear, usually light green. 



3. K. flexuosa. 



Calyx teeth triangular, acute; leaves linear-lanceolate, usually darker. 



4. K. Virginians, 

 Flower clusters not in dense corymbs; leaves usually broader. 



Heads densely flowered; leaves 6 times as long as broad or longer. .6. K. verticillata. 



Heads somewhat loosely flowered; leaves not more than 5 times as long as broad. 



6. K. clinopodioides. 



1. Koellia mutica (Michx.) Britton. 



Low sandy ground in the Coastal Plain region. July-Aug. Eastern U. S. {Pyc- 

 nanthemum muticum Pers.) 



2. Koellia incana (L.) Kuntze. 



Apparently common in dry woods and thicketa of the Piedmont Region. June- 

 Sept. Eastern N. Amer. {Pycnanthemumincanum Michx.) 



3. Koellia flexuosa (Walt.) MacM. 



The most abundant species in our range; seemingly confined to the Piedmont 

 Region. June-Aug. Eastern U. S. (Pycnanthemuvi flexuosum B. S. P.; P. lini- 

 foliaiii PnrsL.) 



4. Koellia virginiana (L.) MacM. 



Not common; along the Potomac east of the fall line. Avig.-Oct. Eastern U. S. 

 (Pycnanthemum virginianum Dur. & Jaclis.; P. lanceolatum Pursh.) 



6. Koellia verticillata (Michx.) Kuntze. 



Wet places throughout the region; not common. July-Sept. Eastern U. S. 

 (Pyrnnnlhemum lorreyi Benth.; P. vertidllatum Pers.) 



6. Koellia clinopodioides (Torr. & Gray) Kuntze. 



Dry soil in the Piedmont Region. July-Oct. Eastern U. S. {Pycnanihemum 

 clinopodioides Torr. &, Gray.) 



K. aristata (Michx.) Kuntze is listed in Brereton's Prodromus. . As this species is a. 

 coastal plant, it is likely that the specimens were collected outside our range. 



Thymus serpyllum L., creeping thyme, has been collected a few times as an escape 

 from gardens. Native of Eur. and Asia; adventive in eastern N. Amer. 



22. CUNILA L. 



1. Cunila origanoides (L.) Britton. Dittany. 



Common in open woods and dry sandy fields. Aug.-Oci. Eastern U. S. (C. 

 mariana L.) 



