274 ALSINACEAE 



acute, or the lower oblong, with very thick midrib, viscid-puberulent; sepals 

 4 mm. long, ovate, scarious-margined; petals 5 mm. long; capsule slightly curved. 

 C. /aeyia?mm A. Nels., not Alboff. Geyser basins: nw Wyo. Mont. Jl-Au. 



3. AMMODENIA J. G. Gmel. 



Perennial fleshy herbs, growing in saline soil, with broad opposite leaves and 

 rather small flowers solitary and subsessile in the leaf-axils and the forks. Sepals 

 5. Petals 5, entire. Stamens 8-10. Disk under the ovary prominent, 8-10- 

 lobed, glandular. Styles 3-5. Capsule subglobose, fleshy, 3-5-valved when 

 mature, the valves entire. Seeds numerous, obovate, not strophiolate. 



1. A. oblongifolia (T. & G.) Rydb. Perennial, with a horizontal rootstock; 

 stems glabrous, 1-6 dm. high, fleshy, simple or sparingly branched; leaves oblong 

 or oblanceolate, acute, 2-3 cm. long; flowers axillary; sepals lance-ovate, acute, 

 4-5 mm. long; petals oblong-spatulate or oblanceolate, acute, about equalling 

 the sepals. Honkneya oblongifolia T. & G. Arenaria peploides major Hook. 

 Saline soil: Ore. — Wyo. — Alaska; e Asia. Submont. My-Jl. 



4. MOEHRINGIA L. 



Low perennials, with slender rootstocks. Leaves opposite, sessile or nearly 

 so, soft. Flowers solitary in the axils or in terminal cymes. Sepals and petals 

 4 or 5. Petals entire. Stamens 8 or 10. Capsule oblong or ellipsoid, at first 

 3-celled, opening by 3 two-cleft valves. Seeds few, smooth and shining, append- 

 aged at the hiliun by a membranous broad strophiole. 



Stem, terete; leaves oval or elliptic-oblong; sepals obtuse or acutish. 1. A/, lateriflora. 

 Stem angled; leaves lanceolate or oblanceolate; sepals very acute or acuminate. 



2. A/, macrophylla. 



1. M. lateriflora (L.) Fenzl. Stems puberulent, decumbent at least at 

 the base, 1-2 dm. high; leaves obtuse or rounded at the apex, puberulent, cilio- 

 late on the margins and ribs, 1-3 cm. long; cymes corymbiform, 1-6-flowered; 

 sepals ovate, 2.5 mm. long; petals obovate, 4-6 mm. long. Arenaria lateriflora 

 L. Wet places among bushes: Lab? — ^N.J. — N.M. — Ore. — Alaska; n' Eurasia. 

 Submont. — Mont. Je-Au. 



2. M. macrophylla (Hook.) Torr. Stems decumbent at the base, finely 

 puberulent; leaves usually acute or acuminate at both ends, 2-7 cm. long; cymes 

 1-5-flowered; sepals ovate-lanceolate, about 4 mm. long, usuaUy exceeding the 

 petals. A. macrophylla Hook. Wet places among bushes: Lab. — Vt. — n N.M. 

 —Calif.— B.C. Submont.— Subalp. My-Au. 



5. ALSINOPSIS SmaU. Sandwort. 



Annual or perennial herbs, often tufted. Leaves opposite, without stipules, 

 sometimes fascicled. Flowers in terminal cymes or rarely solitary in the axils. 

 Sepals 5, often thick. Petals 5, white, entire or merely notched. Stamens 10. 

 Ovary 1-celled; styles usually 3. Capsule ovoid, opening with as many entire 

 valves as there are styles. Seeds several or many, not strophiolate. [Alsine 

 Gaertn., not L.] 



Annuals. 



Plant puberulent above; petals exceeding the sepals. 1. A. tenella. 



Plant glabrous; petals scarcely equalling the sepals. 2. A. dawsonensis. 



Cespitose perennials. 



Sepals acute or acuminate. 



Leaves pungent, arcuate-spreading; sepals l-nerved or indistinctly 3-nerved. 



3. A. occidentalis. 

 Leaves not pimgent; sepals distinctly 3-nerved. 



Petals 6-8 mm. long, much exceeding the sepals. 4. A. macrantha. 

 Petals small, scarcely equalling the sepals. 



Plant densely glandular-puberulent. 5. A. propinqua. 

 Plant glabrous or nearly so. 



Leaves 3-nerved, acutish, flat. 



Leaves hnear-subulate, usually over 1 cm. long; plant cespitose, 



but not densely tufted, 3-10 cm. high. 6. A. verna. 

 Leaves linear-lanceolate, less than 1 cm. long; plant densely tufted, 



about 2 cm. high. 7. A. quadrivalvis. 



