400 COMPOSITtE. Hemizonia. 



the involucre 8-10, rather shorter than the disk. Exterior series of the ohtuse 

 membranaceous chaff' united nearly to the apex ; a portion of the inner also 

 irregularly united with each other, and with the outer series. Rays 8-10, 

 apparently white, a little longer than the disk, broadly cuneiform, deeply 

 3-lobed (the middle lobe smallest), convolute, with an extremely short thick- 

 ened and glandular tube: the fertile achenia with a very short incurved 

 stipe, the base of which is dilated into a scarious disk. Corolla of the disk 

 white or yellowish ; the chocolate-brown anthers tipped (as in other species) 

 with a broad roundish-deltoid appendage ; the ovaries abortive. 



§ 6. Heads many-flmvered, somewhat solitary, hracteate: receptacle chaffy 

 throughout ; the chaff, as well as the scales of the involucre, glandular- 

 laciniate, distinct or united only at the base : pappus none : leaves entire ; 

 the uppermost tipped with a large truncate gland : jio^vers yellowish- 

 white ? 



9. H. macradenia (DC.) : stem suffruticose, much branched ; leaves linear, 

 entire, slightly hairy (as well as the branches), thickish, crowded, with 

 smaller ones often fascicled in their axils; "the lower sparingly serrate" 

 [DC) ; the uppermost and the numerous bracts tipped with a large and ses- 

 sile truncate or cup-shaped gland; scales of the involucre and chafT of the 

 receptacle glandular, their margins and back covered with callous cylindri- 

 cal projections or laciniate teeth, which are terminated by a thick truncate 

 gland ; fertile achenia obovate, gibbous, somewhat angled on the back and 

 face, the apex strongly incurved, and terminated by a short ascending beak; 

 those of the disk sterile. — DC! prodr. 5. p. 693; Hook. S^ Am.! I. c. 



California, Douglas! — This singular plant approaches Calycadenia in 

 habit, as De Candolle remarks ; but ills surely by some mistake that it is said 

 to resemble H. luzulfefolia. We find the achenia to accord with De Can- 

 dolle's description. The heads (half an inch in diameter) are solitary or 

 several, together' and nearly sessile at or near the summit of the branches : 

 the broadly cuneiform numerous rays somewhat exserted, 3-lobed at the 

 apex, and raised on a slender glandular-hispid tube. The upper leaves are 

 about half an inch long, half a line broad (rather dilated at the base), with 

 still smaller ones in the axils, tipped with a gland nearly as in Calycadenia. 



138. CALYCADENIA. DC. prodr. 5. p. 695. 



Heads many-flowered ; the ray-flowers 3-5, pistillate, 3-lobed or 3-parted, 

 with a slender mostly glandular tube; those of the disk tubular, perfect, but 

 mostly infertile. Involucre bracteate at the base ; the scales in a single se- 

 ries, concave, partly enclosing the ray-achenia. Receptacle small and flat, 

 naked in the centre, chaffy at the margin; the chaff" in a single series be- 

 tween the ray and disk-flowers, distinct or united. Corolla of the disk infun- 

 dibuhform, 5-toothed. Branches of the style in the disk-flowers with long 

 fihform hirsute appendages. Achenia somewhat hairy; those of the ray 

 obovoid-triangular, destitute of pappus ; of the disk quadrangular-obcom- 

 pressed, tapering to the base, fully formed and ovuliferous, but apparently in- 

 fertile, with a pappus of 5-10 chaffy and mostly awned scales. — Annual 

 slender (Californian) herbs ; with rigid chiefly alternate narrowly linear or 

 subulate 1 -nerved leaves, with revolute margins ; the floral ones (crowded 



