38 
ARENARIA 
Genus 8. Cerastium (p. 43). Shoot usually more or less hairy. Inflorescence dichasial. Petals 
bifid or notched. Stigmas as many as the sepals. Capsules longer than broad, often curved. 
Genus 9. Stellaria (p. 56). Shoot usually glabrous or nearly so (but cf. 5 . aquatica and the 
series Mediae). Inflorescence dichasial. Petals deeply bifid. Capsules globose or subglobose. 
Genus 10. Holosteum (p. 64). Inflorescence apparently umbellate. Petals jagged. Capsules 
longer than broad. 
Genus 6. Arenaria 
Arenaria L. [Gen. PL 133 (1737);] Sp. PI. 423 (1753) et Gen. PL ed. s, 193 (1754) emend., incl. 
Moehringia-, Gaertner Fruct. ii, 232, t. 130 (1791) incl. Moehringia p. 226, t. 129; Fenzl in Endlicher Gen. Pl. 
967 (1836 — 1840) incl. Moehringia p. 968; Williams in Jonrn. Linn. Soc. xxxiii, 332 (1898) emend, to include 
Moehringia-, Pax in Engler und Prantl Pflanzefam. iii, 1 b, 84 (1889) incl. Moehringia-, Alsinella Gray Nat. Arr. 
Brit. Plants ii, 655 (1821) [non Dillenius], 
Perennial tufted herbs or annuals. Stipules absent. Inflorescence dichasial. Petals entire. 
Stigmas fewer than the sepals. Capsules cylindrical. Seeds arillate or not. 
About 100 species ; cosmopolitan, especially cold and temperate regions. 
British sections of Arenaria 
Section I. Eu- Arenaria (see below). Seeds without an aril. 
Section II. Moehringia (p. 41). Seeds with an aril. 
Section 1. EU- A REN ARIA 
Eu-Arenaria nobis. For character, see above. 
British species of Eu-Arenaria 
1. Ar. ciliata (see below). Perennial. Leaves crowded and (in the British form) narrowly 
spathulate, more or less ciliate. Flowers large (about 14 mm. in diameter). Sebals with the veins 
hairy. 
2. Ar. norvegica (p. 39). Perennial. Leaves crowded, rather smaller than in Ar. ciliata 
and more succulent. Pedicels shorter. Flowers smaller (about 8 — 9 mm. in diameter). Sepals 
glabrous. Petals broader. 
3. fAr. gothica (p. 40). Annual or biennial. Shoot much laxer than in Ar. ciliata and Ar. 
norvegica. Leaves not crowded. Flowers 20 mm. in diameter. Sepals carinate, glabrous. 
4. Ar. serpyllifolia (p. 40). Annual. Upper leaves ovate, acute to subacuminate. Pedicels 
up to 3 times as long as the calyx. Flowers 4 — 7 mm. in diameter. Sepals ovate-lanceolate. 
Petals shorter than the sepals. 
I. ARENARIA CILIATA. Plate 37 
Arenaria ciliata L. sp. PI. 425 (1753)!; Smith Eng. Bot. no. 1745 (1807)!; Wahlenberg FI. Lapp. 151 
(1812); Veg. Helv. 85 (1813); Syme Eng. Bot. ii, 104 (1864); Rouy et Foucaud FI. France ii, 247 (1896); 
Ar. tenella Kitaibel in Schultes Oesterr. FI. ed. 2, i, 662 (1814). 
leones : — Smith Eng. Bot. t. 1745 ; FI. Dan. t. 346; Reichenbach Icon, v, t. 219, fig. 4950, as Ar. nndticaulis. 
Camb. Brit. FI. iii. Plate jy. (a) Flowering branches, (b) Portion of pedicel (enlarged). ( c ) Leaves (en- 
larged). (d) Sepals (enlarged). (*) Petals (enlarged). (/) Ovary. Co. Sligo (R. LI. P.). 
Exsiccata : — Bourgeau (PL Alp. Sav.); Fries, x, 41 ; Schultz (H. N.), ix, 836. 
Perennial, caespitose. Branches springing numerously from the crown of the root ; prostrate, 
decumbent, or ascending. Leaves sessile ; those of the lower barren branches lanceolate, about 5 mm. 
