318 XXXIX. OOMPOSITAE. [Bidens. 



lobed. Flower-heads Jin.— Jin. broad in a dichotomous leafy panicle; outer 



involucral bracts usually longer than the inner^ spreading. Outer florets with 



very short irregularly toothed rays. — Benth., Fl. Austr. iii. 535. 



KBBMADEC Islands. NORTH Island : from Mangonui to the East Cape district, Banks 

 SbTudi Solander I Great Barrier Island, T. .ST. Punawaru. Jan., Feb. 



16. BIDENS, Tourn. 



Involucral bracts in 2—3 series^ few, erect, narrow, slightly connate at the 

 base. Receptacle paleaceous. Ray-florets in 1 series, sterile ; rays short or 0. 

 Disk-florets hermaphrodite, tubular, 5-toothed. Style-arms subulate. Achene 

 4-angled, or rarely compressed, narrow. Pappus of 2—4 rigid retrorsely hispid 

 persistent bristles. Erect herbs, with opposite leaves. Flowers on terminal 

 peduncles. 



Species, about 125, distributed through most warm and temperate countries. 



Name, from the two rigid pappus-bristles of some species. 



1. B. pilosa, L., Sp. PL 832. An erect annual or rarely perennial herb, 

 l£t.— 2ft. high, with angular slightly hairy branches. Leaves membranous, 

 simple or pinnate ; segments mostly 3, rarely 5, petiolulate, ovate or ovate- 

 lanceolate, serrate, fin.— 2in. long. Heads Jin. in diameter, on slender terminal 

 peduncles ; involucral bracts |in. long. Ray-florets few, short or 0. Achenes 

 slender, 4-angled, the inner longer than the outer, 2— 4-awned, striate. — 

 G. Forst., Prod. n. 283; A. Cunn., Precurs. n. 442; Hook, f., Handbk. 138; 

 B. aurantiacus, Col. in Trans. N.Z.I, xxvii. (1894) 388. 



KEEMADEO Islands. NORTH Island : north of the East Gape. 



A common weed in all warm and temperate countries. 



* MADIA, Linn. 



Involucral bracts in 1 or 2 series. Eeceptacle convex, paleaceous. Eay-florets 

 in 1 or 2 series, fertile ; rays short. Disk-florets hermaphrodite, fertile or sterile, 

 tubular, 5-toothed. Style-arms appendiculate. Achene compressed, usually enclosed 

 in one of the receptacular scales. Pappus or consisting of short lacerate scales. 

 Annual or perennial herbs, with entire or rarely pinnatifid leaves, glandular or villous. 

 Heads on slender peduncles, globular. 



* M. sativa, Molina, Sagg. Ghil. ed. i. 136.' An erect annual, lft.-3ft. high. 

 Stem simple or branched, glandular, viscid, hirsute. Leaves alternate, sessile, 

 narrow-oblong or oblong-lanceolate, lin.-3m. long, villous or glandular. Heads on 

 solitary peduncles or racemose ; involucres globose, viscid ; outer involucral bracts 

 glandular-hispid. Achenes curved, angled. 



SOUTH Island: naturalised; Renwioktown, Marlborough, Reader I Otago : between Bal- 

 olutha and Gatlins, T. K, Bannockburn, Petrie 1 Chili. Eeb., March. 



• ACHILLEA, Linn. 



Involucral bracts in 3 series, oblong, usually with scarious margins, imbricated. 

 Eeceptacle paleaceous, narrow. Eay-florets few, fertile ; ligule short and broad. 

 Disk-florets hermaphrodite, tubular, compressed, 5-toothed. Anthers obtuse at the 



