HEMIONITIS 
409 
terranean tuberous stems* like potatoes, with well marked 4 eyes * 
(buds in axils of scale-leaves). 
Helichrysum Vaill. ex Linn. Compositae (iv). 300 sp. Eur., As., 
Afr., Austr. About 150 occur in S. Afr. Many are xerophytes with 
hairy surface, decurrent leaves, &c. The dried flower-heads of some 
sp. are sold as 4 everlastings. ’ 
Helicodiceros Schott. Araceae (vn). 1 sp. Corsica, Sardinia, H. cri • 
nitus Schott (AT. viuscivorus Engl.). The development of the pedate 
leaf is cymose ; the later formed branches grow more slowly than the 
earlier. The specific name viuscivorus is due to the number of flies 
captured; they are attracted by the foul smell of the infl. (cf. Arum) 
and collect inside the spathe in enormous numbers (in the Bot. Gdn. 
Cambridge, the whole spathe may often be seen tightly packed with 
them) ; when it withers the top closes and they are caught. 
Heliconia Linn. Musaceae. 30 sp. trop. Am. Firs, in cincinni. The 
odd sepal is posterior. 
Helicteres Pluk. ex Linn. Sterculiaceae. 40 sp. trop. (exc. Afr.). The 
firs, become zygomorphic if they happen to be in a horizontal position. 
Heliophila Burm. f. ex Linn. Cruciferae (1. 3). 60 sp. S. Afr. 
Heliopsis Pers. Compositae (v). 7 sp. Am. 
Heliotropium (Tourn.) Linn. Boraginaceae (ill). 220 sp. trop. temp. 
H. peruvianum L. (cherry pie) and other sp. of heliotrope are culti- 
vated for their scented firs. 
Helipterum DC. Compositae (iv). 48 sp. Austr., S. Afr. Xerophytes 
with persistent involucre of white scaly bracts ; the dried flower-heads 
are sold as 4 everlastings ’ (cf. Helichrysum, &c.). 
Helleborus (Tourn.) Linn. Ranunculaceae (2). 15 sp. Eur.; 2 in Brit. 
(Hellebore). The plants are woody below, each shoot from the 
stock taking several years to reach maturity and flower. Fir. proto- 
gynous, opening very early in the year. Cpls. slightly coherent at 
base. In H. niger L., the Christmas rose, the perianth turns green 
after the fir. has been fertilised. 
Helminthia Juss. = Picris Linn. 
Helminthostachys Kaulf. Ophioglossaceae. 1 sp. H. zeylanica 
Hk. f., Ceylon, Himal. to Queensland. Rhizome dorsiventral with 
2-ranked leaves on the upper side, and roots below. The roots do 
not bear any definite relation to the leaves. Sporangia peltate, on 
sporangiophores from the sides of the fertile spike. [Cf. Farmer and 
Freeman, in Ann . of Bot . xm. 1899, p. 421 ; Lang on prothallus, 
do. XVI. 1902, p. 23.] 
Helobieae. The 2nd cohort of Monocotyledons (1st of Warming). 
Helonias Linn. Liliaceae (1). 1 sp. east N. Am. 
Helosciadium Koch = Apium Tourn. 
Helosis Rich. Balanophoraceae. 3 sp. trop. Am. 
Hemerocallis Linn. Liliaceae (in). 5 sp. temp. Eur., As. Infl. a 
double bostryx. The flrs. of H. fulva L. are self-sterile. 
Hemionitis Linn. Polypodiaceae. 8 sp. trop. 
