SILYBUM 587 
Seseli Linn. Umbelliferae (6). 60 sp. Eur., N. Afr., As. S. Libatiotis 
Koch in Brit. 
Sesleria Scop. Gramineae (x). 10 sp. Eur., W. As., mostly alpine. 
S. coerulea Arduin. in Brit. 
Sesuvium Linn. Aizoaceae (11. 1). 5 sp. trop. and subtrop. Halo- 
phytes (p. 169). 
Setaria Beauv. Gramineae (v). 12 sp. trop. and warm temp. S. 
italica Beauv. (Italian millet) is cultivated as a cereal in E. As. 
Shepherdia Nutt. Elaeagnaceae. 3 sp. N. Am. The receptacle 
becomes fleshy in fruit. The fruit of S. argentea Nutt, (buffalo-berry) 
is edible. 
Sherardia Dill, ex Linn. Rubiaceae (11. 21). 1 sp. Eur. (inch Brit.), 
W. As., N. Afr., S. arvensis L., the field madder. 
Shorea Roxb. Dipterocarpaceae. 87 sp. Ceylon to Philippine Is. S. 
robusta Gaertn. f. (sal) is a most valuable timber tree, with wood like 
that of teak, and is largely grown in India. 
Shortia Torr. et Gray. Diapensiaceae. 1 sp. N. Carolina, 1 sp. Japan 
(cf. Epigaea). 
Sibbaldia Linn. = Potentilla Linn. S. procumbens h. = P. Sibbaldi. 
Sibthorpia Linn. Scrophulariaceae (in. 10). 6 sp. Eur., Medit., 
Nepal, Andes. S. enropaea L. (Cornish money-wort) in S. England. 
Sicyos Linn. Cucurbitaceae (lv). 30 sp. trop. Am., Polynes., Austr. 
Some sp. have hooked fruits. 
Sida Linn. Malvaceae (11). 70 sp. Am., Austr., 1 Eur., several in 
all trop. lands. 
Sidalcea A. Gray. Malvaceae (11). 10 sp. N.W. Am. 
Sideritis Tourn. ex Linn. Labiatae (vi. 1). 45 sp. Medit., Orient. 
Sideroxylon (Dill.) Linn. Sapotaceae (1). 80 sp. trop. 
Siegesbeclda Linn. Compositae (v). 4 sp. trop. and warm temp. 
The heads are small, with an involucre of 5 bracts, covered with 
very sticky glandular hairs. The secretion continues till after the 
fruit is ripe, and aids in its distribution, the whole head breaking off 
and clinging to a passing animal. 
Silaus Bernh. Umbelliferae (6). 2 sp. Eur., Siberia (1 Brit.). 
Silene Linn. Caryophyllaceae (1. 1). 300 sp. N. temp., esp. Medit. 
(7 in Brit.). The firs, of many sp. are adapted to pollination by 
butterflies, e.g. those of S. acaulis L. (moss-campion, a tufted alpine 
plant); others are pollinated by moths, e.g. S. infiata Sm. (bladder 
campion), which emits its scent at night (p. 92). 
Siler Crantz. Umbelliferae (6). 2 sp. Eur., Siberia. 
Silpliium Linn. Compositae (v). 12 sp. eastern U.S. S. laciniatum 
L. is the famous ‘compass-plant’ of the prairies. If growing in an 
exposed position its leaves turn their edges to north and south. 
They thus avoid the excessive mid-day radiation, and get the full benefit 
of the morning and evening sun. (Cf. Lactuca.) 
Silybum Vaill. ex Adans. Compositae (xi). 2 sp. Medit. S. Maria - 
