OF ARTS AND SCIENCES : MAT 30, 1865. 549 



long, mostly opposite ; the lower oval or oblong, minute. Doubtless 

 this plant grows larger, but probably still remains different from the 

 following species in its much obcompressed and broad achenia, the 

 summit rounded and entirely destitute of any beak. Involucre, as in 

 the other species, hispid-glandular on the back, completely enclosing 

 the achenia. 



Hemizonia (Hemizonella) parvula : bi-tripolhcaris, pilis albi- 

 dis magis hispida; caule patentim ramoso; foliis angusto-linearibus, 

 superioribus capitula sessilia involucrantibus eaque longe superantibus ; 

 acheniis glaberrimis angustis fusifoi'mi-falcatis subtrigono-obcompres- 

 sis, rostro brevi incurvo. — Klamath Valley, Oregon, Mr. Kronkite. 

 Leaves half an inch to an inch long, half a line wide. It is this species 

 which by the achenia most appi'oaches the genus HarpcBcarpus, but 

 these are still decidedly obcompressed instead of compressed ; and it 

 would be very inconvenient now to admit compressed and obcompressed 

 achenia into the same genus. Obviously these little plants are much 

 reduced Hemizonice. 



Hemizonia (Hemizonella) Durandi: caule a basi ramoso 

 3 - 6-pollicari ; capitulis e dichotomiis plerisque pedunculatis folia ful- 

 crantia adaequantibus ; acheniis intus prsesertim parce pilosis, floris 

 centralis trigono apice truncato, radii obovato-oblongis trigono-ob- 

 compressis arcuatis, rostro brevi inflexo. (^Harpcecarpus madarioides, 

 Durand, PI. Pratten. in Jour. Acad. Philad., non Nutt.) — Nevada 

 County, California, Mr. Henry Pratten. Washoe County, Nevada, 

 Mr. Stretch, communicated by Dr. Torrey. — Heads a line and a half 

 in length, larger than in the foregoing species. I think this was also 

 collected by Fremont, in his second expedition. But I possess no 

 specimen of it. 



WHITNEY A, Nov. Gen. Heleniearum v. Senecionearum, epapposum. 



Capitulum multiflorum, heterogamum ; floribus radii ligulatis foemi- 

 neis, disci tubulosis hermaphroditis. Involucrum biseriale, e squamis 

 10-12 agqualibus oblongo-lanceolatis acutis herbaceo-membranaceis. 

 Receptaculum convexo-conicum, epaleatum, dense hirsutum. Ligulas 

 magnge. . Corollas disci infundibuliformes, lobis breviusculis ovatis. 

 Antherae ecaudatse. Stylus radii elongatus, disci ramis brevibus linea- 

 ri-subulatis complanatis obtusiusculis extus hirtellis. Achenia oblonga, 

 obcompressa, calva. — Herba Arnic(B facie, montium CaliforniaJ in- 



voL. vr. 62 



