124 American Midland Naturalist Monograph No. 2 



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



3. Pedicels longer than the sepals, the cyme therefore rather loose; sepals 

 acutish or obtuse, 4-5 mm. long, elliptical-lanceolate, broadly scarious- 

 margined; stems spreading, 10-30 cm. long; plants perennial or bien- 

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

 Common Mouse-ear Chickweed C. vulgatiim L. 



3. Pedicels scarcely longer than the sepals, the cyme therefore compact; 

 sepals acuminate, 5-6 mm. long, linear-lanceolate, narrowly scarious- 

 margined; stem erect, 10-25 cm. tall; plants annual; moist ground; nat. 

 from Eur. Apr.-May C. viscosuf?i L. 



2. Stellaria L. — Chickweed 

 (Alsine L. ex p., non Wahl.) > 



1 . Leaves oval or ovate. 



2. Petals shorter than the sepals; stem terete, with a single line of hairs; 

 stamens 3-7; styles 3-4; plant annual; waste ground and fields, very 



common, adv. from Eur. Mar.-June. Common Chickweed 



S. media (L.) Cyrill. 



2. Petals much longer than the sepals; stem more or less angled, glabrous 



below, glandular-puberulent above; stamens 10; styles 5; plant peren- 

 nial; waste places, occasional; adv. from Eur. Waukegan, Lake Co., 

 July 1, 1908, Gates 2820; Jo Daviess Co., G. N. Jones 15861; Sanga- 

 mon Co., G. D. Fuller 4460. Water Chickweed 



S. aquatica (L.) Scop. 



1 . Leaves linear or narrowly lanceolate. 



3. Pedicels erect; flowers few or solitary; leaves linear-lanceolate, widest near 



the base; seeds smooth; moist ground, not common. July-Aug. [5. 

 longipes sensu auth., non Goldie} S. stricta Richards. 



3. Pedicels spreading, the cymes diffuse. 



4. Leaves linear, acute at each end; fruiting calyx 2-3 mm. long; seeds 

 smooth; moist ground. May-June iS'. longifolia Muhl. 



4. Leaves narrowly lanceolate, broadest near the base; fruiting calyx 4-5 

 mm. long; seeds rugulose; moist ground; adv. from Eur. May-June 

 S. gramin-'a L. 



3. Sagina L. — Pearl wort 

 S. decumbens (Ell.) Torr. & Gray. Dry ground, not common. Apr.-May. 



4. Arenaria L. — Sandwort 



{Moehringia L.) 

 1. Leaves oval or ovate; valves of the capsules 2-toothed or 2-cIeft. 



2. Leaves oval, obtuse, 1-3 cm. long; sepals obtuse, shorter than the petals; 



seeds smooth; woods in the n. half of the state. May-June 



A. lateriflora L. 



2. Leaves ovate, acute, 2-8 mm. long; sepals acuminate, longer than the 

 petals; seeds rough; waste ground; adv. from Eur. Apr.-June. Thyme- 



