Hemitonia. COMPOSITE. 363 



* * Receptaclt flat, with a distinct chaff for each of the 8 or 10 disk-flowers, half en- 

 dosing its sterile akene: heads small: rays 5 : akenes smooth and even, but dull. 



G. H. virgata, Gray. More or ft;ss glandular, but glabrous or slightly hirsute : 

 stem slender, a foot or two high, simple or virgately branched : cauliue leaves 

 linear; the lower laciniate or almost pinnatifid ; upper entire : those of the branches 

 and of axillary fascicles very small (2 or 3 lilies long), crowded, each tipped with 

 a truncate" gland : heads numerous, virgately racemose: corollas glandular, the 5 

 ligules short and broad : scales of the involucre and the similar chaff of the recep- 

 tacle rather chartaceous, obovate or oblong, conspicuously beset over the back with 

 large and prominent tack-shaped stipitate glands : akenes obovate, 5-angled : pappus 

 none. — liot. Mex. Bound. 100. 



Foot-hills, &c., from Napa to Los Angeles. Heals narrow, 3 or 4 lines long ; the glands often 

 a full half line in length, resembling those of the section Calycadenia. The gland terminating 



the smaller leaves is more or less cup-shaped in the dried specimens. Disk-akenes almost fertile. 

 The i>lant exhales a balsamic odor. 



* % * Receptacle convex or coni -o I, many '-flowered, chaffy throughout; the chaff distinct: 

 heads middle-sized: rays rather numerous, and usually in more than one series, 

 short, apparently pal< yellow: akenes hardly if at all rugose, those of the disk 



some of them more or less fertile (these with a "' antral terminal areola). 



— (§ Olocarpha, DC., excl. sp.) 



7. H. macradenia, DC. Loosely branched, a foot or two high, stout, hirsute 

 and viscid-glandular : lower cauline and radical leaves laciniatc-pinnatitid ; the others 

 narrowly linear; uppermost and those of the axillary fascicles filiform-subulate, 

 tipped with a truncate gland : heads mostly glomerate at the end of the branches : 

 scales of the involucre and some of the chaff beset on the back with large long- 

 stipitate glands : rays roundish-cuneiform, 3-lobed : fertile akenes obovate, 5-angled, 

 short-beaked from the inner angle : receptacle strongly conical : pappus none. 



Dry open ground, from the Bay of San Francisco southward. One of the commoner "Tar- 

 weeds," exuding a heavy-scented viscid matter, which blackens the noses of horses. Notwith- 

 standing its frutesccnt aspect, the root is annual, or at most biennial. 



8. BL pungens, Torr. & Gray. Simple and at length much branched, a span 

 to nearly a yard high, hirsute or sparsely hispid: cauline leaves pinnatifid, or the 

 lower bipinnatifid with short spinulose-acuininate lobes; those of the hranchlets 

 and fascicles entire, small and crowded, lanceolate or linear-subulate, rigid, spinu- 

 lose-tipped, as are the scales of the leafy-bracted involucre and the narrow chaff of 

 the receptacle: rays scarcely exceeding the disk, narrow. 2— 3-toothed: pappus 

 none: receptacle strongly convex. — Hartmannia pungens, Hook. & Am.; Hook, 

 le. PI. t. 334. 



Drj hillsides, from San Franci no louthv ird to San Diego, where a very sparingly hirsute form 

 occurs. The root of this species also is annual. Akenes a^ in the preceding, but smaller. 



9. BL Fitchii, Gray. Paniculately branched, rigid, a span to a fool high, villous 

 or somewhal hirsute: radical leaves 1 — 2-pinnately parted into few linear or subu- 

 late divisions; cauline leaves (or the upper ones) like those- of the branches, sub- 

 ulate-linear (about an inch long), rigid and spinulose-tipped, very pungent, the 

 villous pubescence generally accompanied with small very Ion-stalked glands : 

 beads foliose-bracteate : scales of the involucre subulate: rays oblong, 2-toothed, 



little exc ling the disk : chaff of the eon vex and hairy receptacle pointless, bearded 



with long villous hairs: fertile akenes obovate, 3-nngled, smooth, rerj gibbous; 

 sterile disk-akenes with a pappus nearly equalling their corollas, composed of 8 to 

 12 narrowly linear and rigid chaffy Bcnles, which are more or less united at base 

 and fringed oi bearded at tip. — Pacif. b'. Rep. iv. 108. 



Valley of the Sacramento; Clear bake; Long Valley, Plumas < i Carson Valley. 



Alpine Co. A well-marked Bpecies : some younger and loss villous forms resemble h 

 but the chaff is nol pungent, always mon oi less villous-bearded, and the pappus is characteristic. 



