398 COMPOSIT.E. Hemizonia. 



2. H. corymbosa : annual, hirsute-pubescent ; heads nearly solitary at the 

 summit of the stem or branches; leaves pinnately parted, tapering into a 

 petiole ; the lobes 5-9 pairs, linear, entire ; rays 15-20, oblong ; ray-achenia 

 obscurely 4-angular, somewhat rugose or muricate on the back; pappus of 

 the disk-flowers of 6-8 hyaline irregularly laciniate very acute scales, 

 about one-fourth the length of the tube of the corolla. — Hartmannia corym- 

 bosa, DC! prodr. 5. p. 694. 



California, Douglas ! — Nearly a foot high, slender. Chaff scarious ; the 

 exterior series united nearly to the acute herbaceous and hairy tips. Achenia 

 stipitate, tipped with a protuberant areola from the inner margin of the apex. 

 Pappus wanting in the exterior disk-flowers, according to De CandoUe. 



3. H. ? ciliata : annual, stem somewhat glabrous, loosely branched at the 

 summit, but scarcely corymbose ; leaves pinnately parted, with the entire 

 lobes in 5-8 pairs; the lower attenuate into a petiole; the upper (partly 

 clasping) and the floral ones ciliate ; heads many-flowered ; rays ample, 

 10-12, obovate ; achenia all smooth and destitute of pappus. DC. — Hartman- 

 nia ciliata, DC jnodr. 5. p. 694. 



California, Douglas. — Plant with entirely the habit of the preceding ; but 

 the achenia all destitute of pappus and terminated by an areola, and the tube 

 of the corolla obcompressed ; therefore approaching the following tribe. Head 

 nearly that of Chrysanthemum Myconis. DC. — This ambiguous plant is 

 unknown to us. 



§ 3. Heads many -flowered, solitary or crowded at the summit of the branches : 

 chaff of the receptacle in a single series between the ray and disk-flowers, 

 not united : pappus none : leaves undivided. 



4. H. angustifolia (DC.) : stem much branched, suffrutescent at the base ; 

 the branches, leaves, and involucre minutely pubescent ; leaves and bracts 

 narrowly linear, entire; heads bracteate, somewhat solitary; chaff of the 

 receptacle narrow, membranaceous ; achenia obovate, not stipitate, the apex 

 mucronate with a short acute cone. — DC. ! prodr. 5. p. 692. H. congesta, 

 Hook. S^ Am. bot. Beechey, suppl. p. 355 ? 



California, Douglas ! — There appears to be some difficulty in distinguish- 

 ing these two species by the description. What we have as H. angustifolia 

 agrees with the character of De CandoUe, except that the leaves (at least the 

 upper) and the scales of the involucre are clothed with both villous and glan- 

 dular hairs (just as H. congesta is described) ; and the chaff is membranaceo- 

 foliaceous. The stipe of the achenium and the terminal areola doubtless 

 vary with age. The (yellow) rays, about 12 in number, are slightly exsert- 

 ed, with the branches of the style very long and filiform : the tube of the disk 

 corolla glandular, as in most species of the genus, and the teeth hispid- 

 bearded on the margin. The leaves are about half an inch long, and obtuse. 



b. H. congesta (DC): stem herbaceous, erect, branching ; the branches 

 somewhat hispid with soft glandular and glandless hairs; leaves linear-lanceo- 

 late, sparsely villous-glandular; heads bracteate, crowded ; chaff of the recep- 

 tacle somewhat coriaceous, foliaceous ; achenia obovate, obtuse at the apex, 

 when mature produced at the base into a rostrate stipe, which is strongly 

 recurved, and bears a white areola. DC I. c. — H. multicaulis, Hook. Sf 

 Am. I. c. ? 



California, Douglas. — Of this we have no specimen, if our H. angustifolia 

 be the true plant. The H. multicaulis. Hook Sf Am., which is doubtless the 

 same with one or the other of these species, is said to have an annual or 

 biennial root; the stems somewhat simple, or corymbosely branched at the 

 summit, hirsute with soft spreading hairs ; the radical leaves linear-lanceo- 



