24. Caryophyllaceae 83 



4. Leaves without stipules. 



6. Styles as many as the sepals 5. Sagina 



6. Styles fewer than the sepals. 



7. Stamens 10; capsule ovoid 6. Arenoria 



7. Stamens 3-5; capsule cylindrical 7. Holosteum 



1. Sepals united into a tubular calyx; petals clawed. 

 8. Caly.x without bracts at base. 



9. Calyx-teeth much longer than the calyx-tube; styles 5 8. Agrostemma 



9. Calyx-teeth much shorter than the calyx-tube. 



10. Styles 5 or 3 (0 in the staminate flowers of Lychnis). 



11. Styles 3, rarely 4; flowers perfect; capsule opening by 6 teeth 



9. Silene 



11. Styles 5 (or 0) ; capsule opening by 10 teeth 



10. Lychnis 



10. Styles 2 (occasionally 3, rarely 4) ; calyx terete or 5-angled 



11. Saponaria 



8. Calyx subtended by 1-4 bracts, cylindrical; styles 2. 



12. Calyx with 30-40 nerves 12. Dianthus 



12. Calyx with 5-15 ner\es 13. Tunica 



1. Cerastium L. — Mouse-ear Chickweed 



1. Petals much longer than the sepals. 



2. Flowers 1.2-2 cm broad; fruiting calyx 6-7 mm long; capsule 

 12-14 mm long; seeds 1 mm in diameter; plants perennial; 

 in thin soil, chiefly in limestone areas. May-June. Field 

 Mouse-ear Chickweed. [C. arvensc sensu auth., non L.; C. 



aruense var. oblongifolium (Torr.) Hollick & Britt.] 



C. velutinum Raf. 



2. Flowers 5-8 mm broad; fruiting calyx 4-5 mm long; capsule 

 9-11 mm long; seeds 0.4-0.8 mm in diameter; plants annual. 



3. Pedicels 15-40 mm long, hooked at tip; moist ground, com- 

 mon. Apr.-May. Nodding Mouse-ear Chickweed 



C. nutans Raf. 



3. Pedicels 2-10 mm long, not hooked at tip; adv. from the 



West; occasional in 111. Apr.-May 



C. hrachypodurn (Engelm.) B.L.Robins. 



1. Petals equalling or only slightly longer than the sepals. 



4. Pedicels scarcely longer than the .sepals, the cyme therefore 

 compact; plants annual; moist ground, rare; nat. trom Eur. 



Apr.-May C. viscosum L. 



4. Pedicels two to five times longer than the sepals, the cyme 

 therefore rather loose. 

 5. Bracts terminating in long tufts of hairs; plants annual; adv. 



from Eur.; Pulaski and Union counties. Apr.-May 



C. hr achy pet alum Pers. 



5. Bracts without long tufts of hairs at tips; plants perennial; 

 waste ground, lawns, fields, common; nat. from Eur. May- 

 Aug. Common Mouse-ear Chickweed C. vulgatum L. 



