384 Lxxviri. composite!. (J. D. Hooker.) [^Zoegia. 



94*. ZOEGXA, Linn. 



Slender erect branched annuals. Leaves, radical pinnatifid, cauline entire. 

 Heads long-peduncled, heterogamous ; flowers purple, outer 1-seriate, neuter ; 

 disk-fl. § , fertile, tube slender, limb 5-fid to or below the middle. Involucre 

 ovoid or globose ; bracts membranous, op -seriate, outer shorter pectinately 

 ciliate, inner entire tips ciliate -violet; receptacle densely bristly. Filaments 

 glabrous ; anther-bases sagittate, auricles minute connate. Style entire or 

 emarginate. Achenes obovoid, compressed, shining, obscurely ribbed, basal 

 areole lateral, top truncate crowned with 1-4 concentric ridges ; pappus double 

 or triple, outermost, if present, of short chaffy scales, middle one of long smooth 

 bristles, inner of short bristles. — Disteib. 2-4, Mediterranean and Oiiental. 



1. Z. purpurea, Fresen. ; Boiss. Fl. Orient, iii. COS ; 8-12 in.,glabrous or 

 puberulous, very slender, invol. bracts deeply pectinately ciliate, inner with long 

 hair points, outer pappus of oblong chaffy scales, middle white longer than the 

 glabrous achene, inner short subulate. Z. aristata, DC. Prodr. vi. 562. 



NoETH West India; between Kashmir and Wnzuristan, Stewart. — Disteib. 

 Westward to Persia, Arabia and Egypt. 



The specimens are small and withered, but I think referable to Z. purpurea. The 

 outer chaflFf pappus of this species is nowhere described. A very elegant plant, with 

 bright purple tips to the invol. bracts. 



95. CEKTAUREA, Linn. 



Herbs, often rigid. Leaves radical and alternate, entire toothed or pinnatifid. 

 Heads solitary corymbose or panicled, heterogamous (rarely homogamous), 

 purple, violet, blue, white or yellow ; outer-fl. l-ssriate, neuter ; disk-fl. $ , 

 fertile, tube slender, limb straight or oblique 5-fld to the middle or lower, of 

 neuter fl. often larger with a spreading limb. Involucre ovoid or globose ; 

 bracts oo -seriate, imbricate, appressed, margins scarious or coriaceous, or ending 

 in a simple or palmately divided spine or a pectinate appendage ; receptacle flat, 

 densely bristly. Anther-bases sagittate ; auricles connate, tails long or short 

 entire or lacerate. Style-arms with a thickened hairy basal ring, erect and con- 

 nate or shortly spreading. Achenes oblong or obovoid, compressed or obtusely 

 4-angled, often shining, basal areole oblique or lateral; pappus veiy various, 

 bristles rigid or paleaceous, co -seriate, entire serrulate bearded or feathery, 

 rarely 0. — Disteib. Species about 320, European and W. Asiatic, with a few 

 N. & S. American and one Australian. 



The Centaitreas are immigrants from the west into India, and except perhaps C. 

 iberica and C. phyllocejahala, are visitors rather than even denizens. 



1. C. Cyanus, Linn.; Boiss. Fl. Orient, iii. 634; annual or biennial, 

 erect, slender, cottony, leaves narrow radical entire or lyrate-pinnatifid cauline 

 linear, heads ovoid, invol. bracts oblong obtuse cottony, tip broad with brown 

 scarious toothed margins which are decurrent on the sides of the bract teeth 

 triangular, ray-flowers large spreading blue, achenes gi'ey silky longer than the 

 middle row of pappus-hairs. DC. Prodr. vi. 578 ; Clarke Comp. Ind. 242. 

 0. lanata, Roxb. Fl. Ind. iii. 644. 



In corn fields and cultivated places of N.W. India ; sporadic. — Distkib. The 

 Caucasus and westward to the Atlantic. 

 The common corn-cockle of England. 



• The genus Zoegia is omitted in the conspectus of genera, p. 225, where its 

 diagnostic character would be achenes with concentric ridges below the top. It is 

 doubtful whether it was found within the British border. 



