252 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
SILENACEAE. Pink Famity. 
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..............220.2.2.- Lycunis (p. 255). 
Calyx with the lobes foliaceous..........2.022.-.. AGROSTEMMA (p. 256). 
Calyx 5-nerved; styles 2. 
Calyx cylindric, not angled...-............2.220.-22--- SAPONARIA (p. 256). 
Calyx ovate, angled........2..2.2....2.. eee eeeeeeeee VAcoARIA (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. Sacina (p. 259). 
Styles fewer than the sepals or opposite them. 
Disk of the receptacle conspicuous, 8 to 10-lobed. AMMODENIA (p. 260). 
Disk wanting. 
Seeds cach with a strophiole........ 22... MOEHRINGIA (p. 260). 
Seeds without strophioles...............- ARENARIA (p. 260). 
Stipules present, scarious. 
Fruit a one-seeded utricle; sepals spine-tipped.......... Penracarna (p. 264). 
Fruit a capsule; sepals not spine-tipped. 
Styles and valves of the capsule 5................. SPERGULA (p. 263). 
Styles and valves of the capsule 3.............-.- Tissa (p. 263). 
SILENE. Carcurty. 
Calyx with 15 nerves or more. 
Nerves 18 to 23, prominent ..............-.-.-..--------- 1. S. multinervia. 
Nerves 15 to 20, obscure..... 2.222.202 2202 22 eee ee eee eee 2. S. vulgaris. 
Calyx with 10 nerves. 
Plants annual or biennial. 
Inflorescence a simple raceme.............-.---+.-+----- 3. 8S. anglica. 
Inflorescence a cyme or a panicle. 
Plant sticky hairy......-. 222. .22.22222222222--- 4. 8. noctiflora. 
Plant glabrous, except that the middle portion of each 
of the upper internodes is glutinous. ......-.-.-- 5. 8. antirrhina. 
Plants perennial. 
Acaulescent and densely matted...........22.2.....-- 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 § linear 
lobes. 222222 
Blades of the petals cleft into 2 lobes. 
Stems very leafy; petal-lobes small, 
8. S. oregana. 
entire... 2... ..0..22222-20--2-2-- 9. S. spaldingii. 
Stems not very leafy; petal-lobes 
notched ...........-..2.2-2------ 10. S. scouleri. 
Calyx campanulate; ovary not stipitate. 
Plant 5 to 10 cm. high; flowers 1 to 3... .. lL. S. suksdorfir. 
Plants taller; flowers often numerous. 
Blades of petals 2-lobed......... 2... 12. S, douglasii. 
Blades of petals 4-lobed, the lateral 
lobes smaller .....2.2...2.2.----- 13. S. macounii. 
