ARENARIA 



ARENGA 



389 



ARENARIA (arena, sand, where many of the species 

 grow). Including Alsine, Cherteria and Moehringia. 

 Caryophyllacese. Low herbs, mostly with white flowers, 

 usually forming mats, and suitable for borders, carpets, 

 and lawn clumps; many of them also used for rockwork 

 and alpine gardens; spring- or summer-flowering. 



Annual or perennial, with opposite entire narrow ex- 

 stipulate Ivs.: fls. small, terminal or clustered, or some- 

 times axillary; sepals 5; petals 4 or 5, entire or slightly 

 notched, sometimes wanting; stamens 10 (rarely 8); 

 styles mostly 3: fr. a small caps., opening by valves as 

 many or twice as many as the styles. — Perhaps 130-150 

 species, as the genus is here defined, throughout the 

 world but rare in the tropics. Only the perennial spe- 

 cies are commonly cult. Of easiest cult, in almost any 

 soil. Prop, by division; also by seeds, and rare species 

 sometimes by cuttings. Many species of arenaria may 

 be found in the collections of alpine-garden and rock- 

 garden fanciers; but the prevailing cult, kinds are 

 accounted for below Related genera are Cerastium 

 and Stellaria. Monogr. bv F. N. Williams, Journ. Linn. 

 Soc. 33:326 (1897-8). 



aculeata, 16. 

 aretioides, 4. 

 balearica, 3. 

 CKspitoaa. 14. 

 Franklinii, 17. 

 graminifolia, 9. 

 grandi6ora, 10. 



INDEX. 



groenlandica, 8. 

 ,/(i/j iperifolia, 15. 

 juniperina, 15. 

 ianceolata, 6. 

 macrophylla, 7. 

 montana, 11. 



pinifolia, 13. 

 purpurascena, 2. 

 Rosanii, 12. 

 sedoides, 1. 

 tetraquetra, 5. 

 verna, 14. 



A. Petals usually wanting or rvdimentary. 



1. sedoides, Froel. {Cherlhria sedoides, Linn.). Mi- 

 nute green moss-like carpeter, 1 or 2 in. high: fls. uni- 

 sexual or polygamous, greenish, inconspicuous. Mts., 

 Eu. — A choice rock-cover in alpine gardens. Prop, by 

 division or seeds. 



AA. Petals usually present and ■prominent. 

 B. Fls. purplish. 



2. purpurascens, Ramond. Alpine, tufted and de- 

 cumbent: Ivs. ovate-lanceolate, acuminate: fls. on short 

 tomentose pedicels, 2 or 3 on a branch, the purplish 

 corolla exceeded by the sepals. Pyrenees. — A carpeter. 



BB. Fls. white {sometimes purple in No. 16). 

 c. Lvs. ovate-oblong or lanceolate. 



3. balearica, Linn. Very low (3 in. high), creeping, 

 with small ovate glossy thick and cihated lvs.: fls. 

 single on long peduncles; sepals erect. Balearic Isls., 

 Corsica. — Not hardy in latitude of New York City. 



4. aretioides, Portens. Densely cespitose, and making 

 a good green carpet: lvs. oblong-lanceolate, obtuse and 

 short-mucronulate, grooved above and 3-nerved 

 beneath: fls. sohtary, with 4 sepals. — High Alps. 



5. tetraquetra, Linn. Carpeter, 3-6 in., pubescent: 

 Ivs. ovate, keeled, 4-rowed: fls. in heads, with sepals 

 stiff and cihate and nearly equaling petals. France. 



6. Ianceolata, All. Cespitose-procumbent, the sts. 

 ascending: lvs. lanceolate, rounded at ba.se, acute, flat, 

 m.any-nerved below: fls. 1-3, the sepals lanceolate- 

 acute, equahng the petals. High Alps. 



7. macrophylla. Hook. Sts. decumbent and angled, 

 pubescent: lvs. lanceolate or lance-oblong, mostly 

 acute: peduncles slender, l-.5-fld., the sepals lanceolate- 

 acuminate. Labrador and Vt. to the Pacific. Intro.1881. 



cc. Lvs. linear or awl-like. 

 D. Sepals obtuse. 



8. grcenlandica, Spreng. Annual: verj- low, forming 

 mat.s, the decumbent or erectish sts. bearing 1-5 fls.: 

 lvs. linear and obtuse, Ijin. or less long: sepals and 

 petals blunt, the latter .sometimes notched. High alti- 

 tudes and latitudes, but coming to the seacoast in 

 parts of New Eng., and ranging down the mts. to N. C. 

 Intro. 1884. — A neat little alpine. 



9. graminif&lia, Schrad. A foot or less high: lvs. long 

 and filiform, rough-margined: fls. in 3-forked loose 

 pubescent panicles; petals obovate, exceeding calyx. Eu. 



DD. Sepals acute, pointed or even owned. 

 E. Blossoms solitary, or mostly in 2's or S's. 



10. grandifldra, Linn. Fig. 369. Ten in. or less high: 

 Ivs. flat-awl-shaped, 3-nerved and ciliate, the radical 

 ones crowded: fls. large, solitary or in about 2's or 3'9, 

 long-stalked. Eu. — Runs into many forms. 



11. montana, Linn. Smaller: lvs. linear or nearly 

 so: fls. large, solitary, very long-stalked; sepals acumi- 

 nate, less than the corolla. S. W. Eu. 



12. Rosanii, Tenore. {Alsine Rosanii, Fenzl). Low 

 (1-2 in.): lvs. linear-lanceolate and mucronate, hairy, 

 striate: sts. erect, hirsute, about 3-fld.: fls. white, with 

 obovate petals and striate longer sepals. Italy. 



EE. Blossoms 5-7 {or more) together. 



13. pinifolia, Bieb. {Al^ne pinifdlia var. gracilis, 

 Fenzl). Cespitose, the branches ascending: lvs. nar- 

 rowly awl - shaped 

 or bristle-like, often 

 curved : fls. large, in 

 5-7-fld. corymb, the 

 pedicels equaling 

 the calyx or shorter; 

 sepals linear, hairy, 

 3-nerved; petals 

 obovate-oblong, ex- 

 ceeding calyx. Asia 

 Minor. — A dwarf 

 compact plant with 

 small pine-hke foU- 

 age which becomes 

 rosulate on sterile 

 shoots, producing 

 many pure white 

 fls.; an attractive 

 edging and rockery 

 plant. 



14. verna, Linn. 

 (Alsine verna, 

 Bartl.). Dwarf, 1-3 

 in. high: lvs. Unear- 

 subulate, flat, 

 strongly 3-nerved, 

 erect : fls. on fihf orm 

 peduncles, with 

 strongly 3 - nerved 

 sepals. Eu. and 

 Rocky Mts. — Ex- 

 cellent little rock 

 plant. Var. caaspi- 

 tdsa, Hort., is a compact, leafy form, making dense 

 moss-like masses; all summer. 



15. juniperina, Linn. (Alsine juniperina, Fenzl. A. 

 junipefrifblia, Hort.?). Cespitose, nodes often swollen: 

 sts. simple, bearing clusters: lvs. awl-like, mucronate, 

 keeled, about 1-nerved, often recurved and persisting: 

 fls. with lanceolate-acuminate 3-nerved sepals, and 

 longer linear-cuneate white petals. E. Eu. and Asia 

 Minor. — -Variable. 



16. aculeata, Wats. Sts. 4-6 in. high: lvs. stiff and 

 sharp, glaucous: fls. fascicled, white, but often purple. 

 W. Amer. Intro. 1889. 



17. Franklinii, Douglas. Sts. 3-5 in. high, nearly 

 or quite glabrous: lvs. in 3-6 pairs, narrow-subulate, 

 sharp-pointed: fls. in dense cymes at the top of the st. 

 W. Amer. Intro. 1881. l H. B. 



ARENGA (derivation unknown). Palmacex, tribe 

 Arecea^. Tall, usually spineless palms with a thickish, 

 ringed trunk, the upper part of which, and the leaf-stalks 

 are often covered with long black fibers. 



369. Arenaria grandiflora. ( X H^ 



