Hemizonia. composite. 397 



volucre in a single series, oblong or lanceolate, concave or convolute and partly- 

 enclosing the ray-achenia, often subtended by linear bracts. Receptacle flat, 

 chaffy either throughout, or only at the margin and punctate at the centre ; 

 the chaff often more or less united. Corolla of the disk-flowers infundibuli- 

 form, 5-toothed ; the teeth (and often the tube) mostly glandular-bearded. 

 Appendages of the style in the disk-flowers linear or subulate, acute, very 

 hispid. Achenia glabrous ; those of the ray obovoid, gibbous, or slightly ob- 

 compressed, convex on the back (where it is sometimes rugose or sparsely 

 muricate,) often flattish anteriorly, slightly stipitate ; the apex mostly oblique, 

 and terminated with a small often papillose-exserted or beaked areola ; of the 

 disk sterile or abortive, oblong, 5-7-nerved. Pappus none ; or in the disk- 

 flowers sometimes of 5-8 short and unequal lacerate chaffy scales. — Low 

 annual or perennial hairy and sometimes glandular (Californian) plants ; 

 Avith alternate often crowded lanceolate or linear leaves. Heads (middle- 

 sized) solitary or clustered. Flowers mostly yellow. Anthers brownish. 



The achenia of the disk in Hartmanniafasciculata and H. corymbosa are certainly 

 sterile, at least in our specimens, although they contain a rudimentary ovule ; as 

 do nearly all the species placed by De Candolle in Hemizonia. Hence the former 

 genus is only to be distinguished by the pappus ; which is not well described by De 

 Candolle, and which is said to be pardy wanting in one, and entirely so in another 

 of the three species referred to it. The remarkable union of the chaff in some spe- 

 cies of Hemizonia, Hartmannia, and Calycadenia, seems also to have escaped De 

 Candolle's observation. Hooker &■ Arnott have noticed it in Hemizonia, DC; and 

 Nuttall in Hartmannia. 



§ 1. Heads 10-12-flowered, corymbose-fasciculate: chaff of the receptacle of 

 5 or 6 scales in a single series interposed between the ray and disk-flowers, 

 united to the middle: pappus of the disk-flowers chaffy, lacerate-toothed at 

 the apex: leaves incisely pinnatifid. 



1. H. fasciculata: annual, hirsute; stem stout, corymbose above; the 

 small heads numerous, densely fascicled at the summit of the fastigiate 

 branches; leaves linear-lanceolate ; the lower pinnatifid ; the upper incisely 

 toothed or nearly entire, closely sessile ; rays 5, short, obovate-cuneiform ; ray- 

 achenia obscurely rugose on the back when old, or slightly muricate; pappus 

 of the disk-flowers of 5-8 oblong chaffy scales, not half the length of the co- 

 rolla, unequally and very acutely lacerate-toothed at the apex Hartmannia 



fasciculata, DC-! prodr. 5. p. 693; Hook. &^' Am.! bot. Beechey, suppl. p. 

 357. H. gloraerata, Nutt. ! in trans. Amer. phil. soc. I. c. jJ. 391. 



California, Douglas ! Nuttall ! April-May. — A span high. Flowers 

 bright yellow. Disk-flowers enclosed in a 5-6-angular tube or cup, formed 

 by the membranaceous carinate-concave chaffy receptacular scales, which are 

 unhed (although not very firmly) by their edges at least to the middle ; the 

 apex mucronate-acuminafe. Fertile (ray) achenia broad at the summit, with 

 a small beak-like areola projecting from the anterior margin : the stipe short 

 and incurved. 



§ 2. Heads many-flowered, somewhat solitary : receptacle chaffy throughout ; 

 the scales of the outer series united : pappus of the disk-flowers very small, 

 membranous, fimbriate-lacer ate, nearly obsolete {or wanting, DC.) in the ex- 

 terior flowers : leaves pinnatifld. 



