154 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Leaves opposite, never whorled. 

 Stems glabrous, or rarely with a Few hairs near the inflorescence. 



Plants glaucous; flowers numerous, in loose terminal panicles 2. S. latifolia. 



Plants greeu; flowers few. axillary or terminal, usually solitary 3. S. alba. 



Stems hairy, at least near the base. 

 Plants perennial; inflorescence dense, the petals large, pink, showy. 



4. S. caroliniana. 

 Plants annual; inflorescence loose and open, the petals white, or pinkish and 

 very small. 

 Plants stout, viscid-hairy throughout; petals white; calyx 20-30 mm. long. 



5. S. noctiflora. 

 Plants slender, finely hairy below, the upper internodes glabrous except for 

 glutinous rings; petals pink, inconspicuous; calyx 4-6 mm. long. 



6. S. antirrhina. 



1. Silene stellata (L.) Ait. • Starry campion. 

 Woods, especially along the upper Potomac; common. June-Aug. Eastern U. S. 

 Silene armeria L., sweet william catchfly, was collected by Ward, June 2, 1878, 



in the Insane Asylum woods. Native of Eur.; a glabrous annual, the pink flowers 

 in dense cymes. 



2. Silene latifolia (Mill.) Britten & Rendle. Bladder campion. 

 Woodside and Ammendale. Native of Eur. and Asia; adventive in many part 



of the U. S. 



3. Silene alba Muhl. Snowy campion. 

 Islands of the Potomac and on the flats below High Island; also near Glen Echo 



and in Rock Creek Park; abundant along the Patuxent at Laurel. June-July. 

 Northern states, south to Md. (S. nivea Otth.) 



4. Silene caroliniana Walt. Wild pink. 

 Sandy soil; rather common, especially along the upper Potomac. Apr.-June. 



Eastern U. S. (S. pennsylvanica Michx.) 



6. Silene noctiflora L. Night-flowerinq catchfly. 



Well established about Beltsville; occasional elsewhere. Native of Eur.; adven- 

 tive in many parts of the U. S. 

 6. Silene antirrhina L. Sleepy catchfly. 



Common in dry or sterile soil. May-June. Widely distributed in N. Amer. 



S. antirrhina divaricata Robinson, with more slender spreading pedicels and apeta- 



lous flowers, has been collected on High Island and Plummers Island, and at Chain 



Bridge. 



3. LYCHNIS L. 



1. Lychnis alba Mill. White campion. 



Bunker Hill and Chevy Chase Lake, Native of Eur.; sparingly adventive in the 

 northeastern U. S. (L. vespertina Sibth.) 



The flowers in this species are pistillate and staminite, the two kinds borne on the 

 same or separate plants. 



A single specimen of Lychnis fln-cwsuli L. w.is c dlooted at "Washington. Intro- 

 duced," in 18fi9 by II. Brummel. Native of Eur.; cultivated and rarely adventive 

 in the northeastern U. S. 



4. DIANTHUS L. 

 1. Dianthus armeri* L. Deftford pink. 



Usually in dry soil; common. May- July. Native of Eur.; naturalized in eastern 

 N. Amer. 



A close relative of the common cultivated sweet william (Dianthus barbatus L.). 

 The carnation, also, belongs to this genus. 



