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STEIRACTINIA, A NEW GENUS OF COMPOSITA. 
By 8. F. Braxs, A.M. 
(PLATE 539.) 
aglengenne n. genus Verbesinearum Perymenio proximum 
o radiis neutralibus differt—Capitula radiata, ig radii 
Seatralibus disci hermaphroditis fertilibus. Involucrum hemi- 
sphericum, squamis 3—4-seriatis paullum gradatis reine 
brevioribus) vel subeequalibus ; extimis paucis (ca. 4) ovalibus ad 
oblongis obtusis vel acutis herbaceis infra medium in ie dum in 
basin angustiorem subinduratam contractis strigosis vel strigil- 
losis; interioribus sensim membranaceoribus paullum siccis ; 
intimis apice plerumque eroso-ciliolatis. Receptaculum compla- 
atum, paleis mabey" atis subscariosis pes om infra apicem 
angustatis flores amplectentibus onustum. rolle radii ligulate, 
ania 
semper ?) alata; ale ad apicem patelliformem pappiferum achenii 
adnate. Ariste pappi numerose (ca. 16—40) liberze tenues sursum 
spinulosx inzquales vel choy sang (duabus longioribus in angulis 
achenii exceptis) caducw.—Frutices ramosi in boreali Austro- 
America incole. Folia opposita 3. nervia ovata ad oblongo-ovata 
serrulata vel subintegra + pubescentia. Capitula mediocria vel 
gna i icibus ramorum in pedunculis monocephalis axillaribus 
et terminalibus subternate cymosa. Achenia + seen pube- 
scentia.—Species typica S. mollis. 
The genus Stetractinia (ersipos, sterile, and dure, ray, from the 
neutral ae: me is ame - ted to Pe erymentum Sporn from 
which it differ 
sha d pappus- sare ip uae of the achene. oh 'Daryhenium the 
Hemsl. and in P. Mavhecoeit neg. Petters, ae riders 
PF. m Blak of 
Aascreclioss are Pelen uk with the Sng eee of S. mollis, the 
type species, known at present only or. ee 
differs from Perymenium as does A from Zexm 
essed achene 
with somewhat different apex, fully entitles it to generic rank 
JOURNAL oF Borany.—Vou. 53. [Junz, 1915. N 
