OF ARTS AND SCIENCES. 217 



Ambrosia pdmila, the Franseria pumtla, Nutt., and of Torr, & 

 Gray, FI. ii. 293, of which " we had not seen the fruit," nor had 

 Nuttall, is a good Ambrosia, with muticous fruiting involucre. Occa- 

 sionally two of these are connate at base, on which character Delpino 

 founded his genus Heinianihrosia. The species is very closely related 

 to A. CANESCENS, namely A. fruticosa, var. canescens, Benth. PI. 

 Ilartw. 17, of Mexico. But that is taller, more silvcry-canescent, 

 with narrower lobes to the leaves, slender-pedicelled sterile heads, 

 and some small spines to the fruiting involucre ; the latter character 

 probably unreliable. 



RuDBECKiA MONTANA. E grege Ji. occidentalis, procera, lasvis, 

 fere glabra; foliis pinnatifidis, sumrais pauci-laciniatis, lobis paucijugis 

 lanceolatis, terminali majore nunc oblongo-ovato ; ligulis nullis ; disco 

 primum ovoideo, fructifero cyliudraceo 1-3-pollicari ; acheniis cum 

 pappo longius cupulato liu. 3-4-loiigo. — Rocky Mountains of Colo- 

 rado ; E. Hall, sjjec. cult. Elk INIountaius, Colorado, Brandegee. 



RuDBECKiA MoHRii. R. atroriibcnti, Nutt., per-aflinis, ramosior, 

 glaberrima ; foliis minus rigidis angusto-linearibus viridibu.s ; disco 

 atro-fusco subgloboso ; ligulis luteis ; paleis receptaculi parum mucro- 

 natis ; acheniis longioribus subcurvatis areola obliquo iusertis ; pappo 

 profunde cupulato. — Margin of ditches and ponds near the Dead 

 Lakes, not far from lola, W. Florida, June 22, 1880, Cliarles Muhr. 

 This has some affinity on the one hand with R. nitida, but is a much 

 nearer relative of it. atrorubens, which is quite of this genus, and no 

 Echinacea. Dr. Mohr collected these two peculiar species in the same 

 district. 



Gymnolomia TRILOBA. Subglabra, ramosa ; radice ignota ; foliis 

 alternis lato-ovatis trilobis basi truncata vel subcordata ; involucri 

 bracteis linearibus disco hemisphterico demum ovoideo brevioribus ; 

 receptaculo conico ; acheniis glaberrimis subcompressis calvis. — On 

 peaks of the Chirricahui Mountains, south of Rucker's Valley, Ari- 

 zona, Lemmon. 



Synedrella vialis. Calyptrocarpus vialis, Less. Syn. 221, & 

 Linno3a, ix. 269. Oligogyne Tampicana, DC. Prodr. v. 629 ; Deless. 

 Ic. Sel. iv. t. 38; Gray, PI. "Wright, i. 111. Blainvillea Tampicana, 

 Hemsl. Biol. Centr.-Am. ii. 169. In PI. Wright., above cited, I had 

 noted the near relationship of this plant to Synedrella as well as to 

 Blainvillea, and concluded that the wingless akenes mainly distin- 

 guished it from the latter genus. I had then seen no winged or mar- 

 gined akenes, and did not know that upon this plant was founded the 



