Small : North Amkrican Plants 279 



Phlox Brittonii 



Perennial, deep green. Stems copiously branched ; branched 

 matted, forming wide tufts, glandular-pilose : leaves numerous, 

 small ones often clustered in the axils of the larger; blades subu- 

 late or narrowly linear-subulate, 5-10 mm. long, ciliate, especially 

 near the base : calices 5-6 mm. long, glandular-pubescent like the 

 branches ; segments subulate, about as long as the tube : corolla 

 white : tube curved, about i cm. long ; limb 12-13 mm. wide ; 

 segments cuneate, with 2 pale magenta spots near the base, cleft 

 by a V-shapcd sinus about 3 mm. deep, usually with a minute 

 tooth in each sinus, tips acute or acutish. 



On dry mountain slopes, Virginia and West Virginia to North 

 Carolina. Spring and Summer. 



A relative of Phlox siibu/ata but more delicate in all its parts. 

 The contrasting characters may be shown as follows : 



Phlox Brittonii Phlox subulata 



Stems or branches glandular- Stems or branches not glan- 



pilose : leaf blades mostly 5-10 dular : leaf-blades mostly lO- 



mm. long: calices 5-6 mm. long: 15 mm. long: calices 8-9 mm. 



limb of corolla less than 14 long: limb of corolla over 15 



mm. broad ; lobes usually with mm. broad ; lobes usually with 



a minute tooth in each sinus. toothless sinuses. 



The specimens upon which the species is based were collected 

 by Dr. N. L. Britton, at White Sulphur Springs, West Virginia, 

 May, 1898. Dr. Britton then introduced the species in the herba- 

 ceous grounds of the New York Botanical Garden where the plants 

 have become thoroughly established. 



Vernonia interior 



Perennial, finely and usually closely pubescent. Stems erect 

 or ascending, 1-2 meters tall, simple below the inflorescence : 

 leaves numerous ; blades elliptic to elliptic-lanceolate, 6-20 cm. 

 long, acuminate, sharply and rather finely serrate, sessile or nearly 

 so : heads numerous, rather crowded : involucres campanulate, 

 6-y mm. high, 4-5 mm. broad : bracts pubescent, sometimes 

 hoar}% acute or with short keel-like acuminations, the tips erect or 

 slightly spreading : achenes pubescent : pappus purple. 



On plains or prairies, Missouri and Kansas south to Texas. 

 Spring to fall. 



