Heterachcena.] lxxiii. composite] (oliver and hiern). 455 



113. HETERACHiENA, Fresen. ; Benfch. et Hook. f. Gen. 

 PI. ii. p. 526. 



Capitnla homogamons, ligulate. Involucre cylindrical, at length 

 thickened at the base; inner bracts narrow, elongated, equal, mem- 

 branons; the outer ones few, small. Receptacle flat, naked. Ligule 

 truncate, 5-dentate at the apex. Anthers sagittate at the base ; 

 auricles acute or shortly setaceous-acuminate. Style-branches slender. 

 Outer achenes narrow, dorsally compressed, oo-costate, transversely 

 rugulose, attenuate at the base, contracted at the apex into a very short 

 beak ; the inner achenes narrow, sui)terete, 4-5-costate, smooth. 

 Pappus copiously setaceous, smooth, persistent or deciduous in one 

 piece. — An annual glabrous herb, dichotomously branched, with alter- 

 nate leaves and blue flowers. 

 A monotypic genus. 



1. K. xnassaviensis, Fresen. in Mus. Senchenh. iii. p. 74 (1839). 

 A slender deHcately branched annual 1-2 ft. high ; branches terete 

 glaucescent. Stem-leaves runcinate, more or less deeply pinnatifid or 

 undivided, cordate, auriculate-amplexicaul, sessile, denticulate, often 

 ciliately so, 1^-4^ in. long ; radical leaves petiolate. Capitula nar- 

 rowly oblong, ^-^ in. long, 9-10-flowered, on slender pedicels of 

 J-1 in., in a lax corymbosely paniculate cyme. Inner involucral bracts 

 5, narrowly lanceolate, obtuse. Achenes |-J in. long. — Laduca mas- 

 saviensisj Schultz Bip. in Herb. Schimp. Abyss, ii. n. 1045, iii. n. 1462 ; 

 A. Rich. Fl. Abyss, i. p. 460 ; Sonchus massaviensis^ Schultz Bip. in 

 Schweinf. Beitr. Fl. ^thiop. p. 160 ; Brachyramphus lactucoides^ T. 

 Anders, in Joum. Linn. Soc. Lond. Bot. v. Suppl. i. p. 23. 



Wile :Land. Abyssinia, Schimper ! Ehrenherg ! Somali, Hildebrandt, fide Vatke 

 in Oesterr. Bot. Zeitschr. 1875, p. 329. 

 Occurs also, in Arabia. 



114. REIOHARDIA, Roth, Bot. Abh. p. 35 (1787) ; {Picridium, 

 Desf. ; Benth. et Hook. f. Gen. PL ii. p. 527.) 



Capitula homogamous, ligulate. Involucre campanuJate ; bracts 

 in many rows, imbricated ; the outer ones gradually shorter, broader, 

 scarious-margined. Receptacle flat, naked. Lignle truncate, 5-den- 

 tate at the apex. Anther- base sagittate ; auricles shortly setaceous- 

 acuminate. Style-branches slender. Achenes glabrous, oblong, 

 subterete, 4-5-costate, transversely rugose, slightly constricted but 

 not beaked at the apex. Pappus copiously setaceous, smooth, white, 

 deciduous in one piece. — Erect glabrous herbs, with alternate or 

 radical toothed or pinnatifid leaves, capitula on long peduncles, and 

 yellow flowers. 



A genus of a few Bpecies, chiefly inhabiting the Mediterranean region. 



1. R. tin^Itana, Both Bot. Ahh. p. 35 (1787). Erect annual (at 

 least as to our specimens) 1-2 ft. high. Leaves oblong oblong-ovate 

 or lanceolate or the lower ones obovate, undivided or pinnatifid, 



