868 LXV. COMPOSITE. 



53. ZINNIA, Linn. 

 (After Job. Gotter. Zinn.) 



Involucre of 3 or more rows of broad imbricate obtuse bracts. Head betero- 

 gamous, radiate ; ray-fiorets female, with leathery ligule, persistent on the fruit. 

 Receptacle conical, paleaceous. Disk-florets villous at the lobes. Style- 

 brancbes with a conical hairy appendage. Acbenes of the disk compressed, 

 usually 1 or 2-awned, of the ray-florets subtrigonal. — Herbs. Leaves opposite, 

 entire ; beads solitary, terminal. 



Previous to the Queensland species being met with early in 1891, this genus was thought 

 to be confined to the New World. 



1. Z. australis (Australian), Bail. Bot. Bull. iii. An erect branching 

 hispid annual, about 1-J-ft. high. Stem angular, hairs white and very numerous 

 on the upper part of the plant. Leaves sessile, ovate-acuminate, 6 or 7-nerved, 

 scabrous on both sides, about 2in. long, lin. broad near the base. Flower-heads 

 pedunculate above the last leaves, showy purple-rayed, involucre globose- 

 turbinate, about 4 lines long. Bracts closely imbricate, obtuse, with scarious 

 margins. Ray-florets 8, purple on the inside, nearly lin. long, spatbulate, 

 3-toothed ; style-branches filiform, obtuse ; disk-florets exceeding the involucre, 

 forming a prominent conical centre of the flower-head. Achenes flat, ovate, 

 with a prominent midrib, more or less scabrous with ciliate margins. 



Hab.: Walsh Eiver, T. Barclay-Millar. 



Nearly allied to Z. pauciflora. — Linn. 



Many forms of Z. paucifloracbni Z. elegans are met with near the principal towns as strays 

 from garden culture. 



64. SIEGESBECKIA, Linn. 



(After George Siegesbeok, M.D.) 

 Involuerali3racts in about 2 rows, the outer ones linear-spatbulate, spreading, 

 glandular-hispid, the inner ones ovate or oblong, half enclosing the achenes, 

 glandular-hispid on the back. Receptacle chaffy, the scales half enclosing the 

 achenes. Eay-florets female, shortly ligulate or irregularly 2 or 8-lobed. Disk- 

 florets hermaphrodite, fertile, tubular, 5-toothed. Anthers obtuse at the base. 

 Style-branches short, somewhat flattened, very obtuse or rarely tipped with a 

 small glandular cone. Acbenes somewhat turgid, usually curved. Pappus 

 none. — Herbs with opposite leaves. Flower-heads rather small, pedunculate. 



A genus of very few species widely dispersed over the warmer regions of the globe, the only 

 Australian one being the most common, especially in the Old World Benth. 



1. S. orientalis (eastern), Linn.; DC. Prod. v. 495 ; Benth. Fl. Austr. 

 iii. 535. A pubescent branching rather stiff annual, 1 to 5ft. high. Leaves 

 from broadly ovate-triangular to lanceolate, li to 2in. long or the lower ones 

 larger, the petioles variable in length, usually dilated upwards but not at the 

 base. Flower-heads 3 to 6 lines broad, in a dichotomous leafy panicle. Outer 

 involuoral bracts often 4 or 5 lines long and covered with gland-bearing hairs, 

 but sometimes shorter than the inner ones and less glandular. Florets small, 

 the rays very short. — Wight, Ic. t. 1103 ; S. microcephala and S. gracilis, DC. 

 Prod. v. 496. 



Hab.: Wide Bay, LaichhanU : Eockhampton, Thozet ; Brisbane Eiver, Moreton Bay, l. 

 V. Mueller. A common -weed. 



55. ENHYDRA, Lour. 



(Plants found near water.) 



(Tetraotis, Beinvi.) 



Involucre of 4 broad leafy bracts closely enveloping the florets,, the two outer 



ones larger than the inner ones. Eeceptical conical, chaffy, the scales enclosing 



the florets and achenes. Ray -florets in several rows, female, with very short 



