372 LXXIII. COMPOSITE (OLIVER AND HIERN).  [Sigesbeckia. 
opposite simple petiolate toothed or serrate leaves and loosely panicled 
pedunculate capitula. 
A genus of 2 or 3 species, one of which is peculiar to this Flora. 
Involucral bracts spreading, linear-spathulate with stipitate glands 1. 8. orientalis. 
Involucral bracts oblong, scarcely exceeding the florets, eglandular 
or glands sessile . 2. S. abyssinica. 
1. S. orientalis, Linn. Sp. Pl. edit. i. p. 900. Pubescent an- 
nual, 1-3 ft. high. Stem erect, sulcate-striate, terete, di- or tri 
chotomously branched. Leaves from deltoid-ovate to lanceolate, 13-5 
by 1-3 in., mostly acuminate, dentate, membranous, often cuneately 
attenuate into a petiole of }-1} in. Capitula }-} in. diameter, hemi- 
spherical, on peduncles ranging up to 1 ‘in., in a usually dichotomous 
leafy panicle. Bracts of the involucre 3-5, usually elongated and }-§ 
in. long, covered with stipitate glands. 
Nile Land. Dalak Island, Red Sea, Dillon (t. Klatt). 
Widely spread over warmer regions especially in the Old World. 
2. S. abyssinica, 0. §- H. Scabrid herb, 2-3 ft. high. Stem 
erect, sulcate-striate, terete, but little branched. Leaves ovate or the 
upper lanceolate, acuminate, serrulate, membranous, somewhat ex- 
cavated near the wedge-shaped base, 2-4 by 4-14 in. ; petioles gl in., 
amplexicaul. Capitula t-4 in. diameter, hemispherical, on peduncles 
ranging up to 2 in., ina leafy narrow panicle. Bracts of the involucre 
4-5, oblong, pubescent, 4 in. long, obscurely 5-nerved, exceeding the 
pales. Some minute sessile glands are scattered over the bracts of 
the involucre.—S. orientalis (forma), Benth. et Hook. f. Gen. Pl. 0. P- 
359. Iimnogenneton abyssinicum, Schultz Bip. in Walp. Rep. v1. P- 
147. Cryphiospermum abyssinicwm, Schultz Bip. in Hb. Schimp. 
Abyss. ii. n. 1059, and in Walp. 1. c. 
Nile Land. Abyssinia, Schimper! Quartin Dillon. ‘hout 
Differs from 8. orientalis, L., by much shorter outer involucral bracts, withou 
stalked glands. 
56. ENHYDRA, Lour. ; Benth. et Hook. f. Gen. Pl. ii. 360. 
_ Capitula axillary, heterogamous ; ray-florets multiseriate, 1con- 
spicuons, pistillate. Involucral bracts 4, broad, leafy, opposed in pairs. 
Palez closely sheathing the florets of the prominent receptacle. Disk- 
florets with regular 5-toothed corolla. Anther-base obtuse, entire. 
Achenes oblong, angled or subterete; pappus 0.—EHrect or creeping 
herbs of wet places, with opposite sessile or shortly petiolate narrow 
leaves, and axillary sessile or subsessile roundish whitish or gree2)® 
capitula. 
A genus common to the Tropies of both hemispheres. 
1. &. fluctuans, Lowr. Fl. Cochinch. p. 511. A marsh or aquatic 
perennial herb, 1-2 ft. high. Stem elongated, rooting, creeping OF 
ascending, simple or branched, glabrous or scabrid-pubescent above. 
Leaves linear or linear-lanceolate, glabrous or slightly pubescent, en- 
tire or toothed, very shortly petiolate, 1-8 in. long, base subhastate OF 
