252 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



SILENACEAE. Pink Family. 



Sepals united; petals long-clawed. 

 Calyx 10 to many-nerved. 



Styles 3, rarely 4 or 5; capsule with 3 or 6 teeth Silene (p. 252). 



Styles always 5; capsule with 5 or 10 teeth. 



Calyx with tooth-like lobes Lychnis (p. 255) . 



Calyx with the lobes foliaceous Agrostemma (p. 256). 



Calyx 5-nerved ; styles 2. 



Calyx cylindric, not angled Saponaria (p. 256). 



Calyx ovate, angled Vaccaria (p. 256). 



Sepals free to the base or nearly so. 

 Stipules wanting. 



Petals 2-cleft or 2-parted, rarely none. 



Capsule cylindric, usually curved Cerastium (p. 256). 



Capsule ovate or oblong not curved Alsine (p. 257). 



Petals entire or notched, rarely none. 



Styles as many as the sepals and alternate with them. Sao in a (p. 259). 

 Styles fewer than the sepals or opposite them. 



Di.sk of the receptacle conspicuous, 8 to 10-lobed. Ammodenia (p. 360). 

 Disk wanting. 



Seeds each with a strophiole Moeiiringia (p. 260). 



Seeds without strophioles Arenaria (p. 260). 



Stipules present, scarious. 



Fruit a one-seeded utricle ; sepals spine-tipped Pentacaena (p. 264). 



Fruit a capsule; sepals not spine-tipped. 



Styles and valves of the capsule 5 Spergui.a (p. 263). 



Styles and valves of the capsule 3 Tissa (p. 263). 



SILENE. Catchfly. 

 Calyx with 15 nerves or more. 



Nerves 18 to 23, prominent 1. 5. multinervia. 



Nerves 15 to 20, obscure 2. S. vulgaris. 



Calyx with 10 nerves. 



Plants annual or biennial. 



Inflorescence a simple raceme 3. S. anglica. 



Inflorescence a cyme or a panicle. 



Plant sticky hairy 4. 5. noctifiora. 



Plant glabrous, except that the middle portion of each 



of the upper internodes is glutinous 5. S. antirrhina. 



Plants perennial. 



Acaulescent and densely matted 6. S. acaulis. 



Caulescent. 



Flowers solitary in the forks of leafy branches 7. S. menziesii. 



Flowers in terminal panicles, or occasionally solitary. 



Calyx cylindric, narrowed at base ; ovary stipitate. 



Blades of the petals cleft into 4 to 8 linear 



lobes 8. S. oregana. 



Blades of the petals cleft into 2 lobes. 



Stems very leafy; petal-lobes small, 



entire 9. S. spaldingii. 



Stems not very leafy, petal-lobes 



notched 10. S. scouleri. 



Calyx campanulate; ovary not stipitate. 



Plant 5 to 10 cm. high; flowers 1 to 3 11. S. suksdorfii. 



Plants taller; flowers often numerous. 



Blades of petals 2-lobed 12. S. dougUsii. 



Blades of petals 4-lobed, the lateral 



lobes smaller .* 13. S. macounii. 



