84 ALSINACEAE 



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



2. M. macrophylla. 



6. ALSINOPSIS Small. Sandwort. 



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 1-nerved or indistinctly 3-nerved. 



3. A, occidentalis. 

 Leaves not pungent; 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 Unear-subulate, usually over 1 cm. long; plant cespitose, 



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



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

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



Leaves usually l-nerved, obtuse, more or less triangular in cross-sec- 

 tion, fleshy. 8. A. Bossii. 

 Sepals obtuse. 



Petals equalling or somewhat exceeding the sepals; plant 1-5 cm. high. 



9. A. obtusiloba. 

 Petals twice as long as the sepals; plant about 1 dm. high. 10. A. laricifolia. 



6. ARENARIA L. Sandwort. 



Annuals; leaves ovate, 4-7 mm. long. 1. A. serpyUifoKa. 



Perennials. 



Leaves neither narrowly linear nor pungent. 



Plant low and spreading; stems less than 1 dm. long: leaves ovate-oblong, less 

 than 1 cm. long. 

 Sepals obtuse or acute; midrib not very prominent; leaves glabrous. 



2. A. cylindrocarpa. 

 Sepals acuminate; midrib very prominent; leaves puberulent. 



3. A. polycaulos. 

 Plant taller; stems 2-4, dm. long; leaves oblong or linear-oblong, more than 1 cm. 



long. 4. A. confusa. 



Leaves narrowly Unear, more or less rigid and pungent. 

 Sepals ovate or ovate-lanceolate. 



Inflorescence contracted and head-like. 



Bracts ovate, not scabrous-ciliolate, only scarious-margined. 



5. A. congesta. 

 Bracts narrowly lanceolate, scabrous-ciliolate, wholly scarious, except the 

 midrib. 6. A. cephaloidea. 



Inflorescence more open. 



Sepals obtuse, or some acutish, or apiculate. 

 Plant glabrous. 



Bracts linear-lanceolate, scarcely scarious-margined. 



8. A. nardifolia. 

 Bracts ovate-lanceolate or ovate, broadly scarious-margined, with 

 green midrib. 9. A. lithophila. 



Plant more or less glandular. 



Sepals 4-5 mm. long; petals about twice as long as the sepals. 



10. A, formosa. 

 Sepals 2-3 mm. long ; petals half longer than the sepals. 



11. A. salmonensis. 

 Sepals distinctly acute or acuminate. 



Petals deeply 2-cleft. 12. A. Kingii. 



Petals not deeply 2-cleft. 



Plant with a cesnitose perennial caudex; all bracts usually broadly 

 lanceolate and broadly scarious-margined. 

 Capsule scarcely exceedmg the sepals: leaves ascending. 



Flowers all pediceUed, in open regular cymes; inflorescence 

 more or less glandular. 

 Leaves distinctly pungent; plant sparingly glandular- 

 puberulent. 

 Sepals 4-5 mm. long: plant not densely tufted. 



13. A. uinlahensis. 

 Sepals 3 mm. long; plant low, densely tufted. 



14. A. compacta. 

 Leaves more fleshy, not pimgent; inflorescence and calyx 



densely glandular-pubescent. 15. A- Tweedyi. 

 Flowers mostly subsessile, in small glomerules at the ends of 

 the branches of the very irregular cymes. 

 „ , , . 16. A. Burkei. 



Capsule almost twice as long as the sepals ; leaves spreading. 

 „, ^ _ ^ ^ ^, . , 17. A. aculeata. 



Plant suffrutescent, the perennial portion of the stems often 1-2 

 dm. high; lower bracts subulate, only the upper scarious. 



18. A. glabrescens. 



