100 CHARACTERS OF SOME GNAPHALIOID COMPOSITÆ. 
20. 
21. 
22. 
***%%* Capitula 5-15-flora, pl. m. pedicellata, folioso-bracteata, 
capitato-glomerata ; bracteis extimis (ut in Craspedia) glome- 
rulum iuvolucrantibus. Axis, seu receptaculum generale, 
pl. m. divisum, lanatum. Receptaculum partiale nudum. 
Transitus facile ad Helichryseas. 
CnossoLEPIS, Less.? Pappus nullus. Involucri squamæ inap- 
pendiculatæ, fimbriato-laceræ. 
****** Cupitula 6-20-lora, in glomerulum exscapum humi 
adpressum, foliis radicalibus rosulatis involucratum, dense 
aggregata, sessilia. Receptaculum partiale paleis scariosis 
persistentibus flores fulerantibus onustum. Pappus nullus 
vel coroniformis.—Transitus ad Cassinieas. 
CHAMÆSPHÆRION, nov. gen. Pappus coroniformis, lacerus, 
caducus. Capitula 5—7-flora: receptaculum planum. 
CHTHONOCEPHALUS, Steetz. Pappus nullus. Capitula pluriflora : 
receptaculum conicum. 
DITHYROSTEGIA, nov. gen. 
Capitula pauca, pauciflora, in glomerulum involucro generali cyathi- 
formi subspathaceo bivalvi herbaceo cinctum dense aggregata, 
singulis exinvolucratis. Receptacula generalia et partialia parva, 
angusta, angulata, villis prælongis flores subæquantibus onusta. 
Flores hermaphroditi, singuli palea lata hyalina tenuissima enervi 
superne in villis tenerrimis soluta obvoluti, pauci centrales ovario 
inani sæpius steriles. Corolle tubulosæ, glabræ ; tubo gracili, limbo 
cyathiformi 5-partito. Anthere basi caudate, appendice angusta supe- 
rate. Styli rami apice capitellati, penicillati. Achenia fertilia ovoideo- 
fusiformia, hispidissima, suberostria ; sterilia linearia, glabra. Pappus 
coronula setularum pilis achzenii consimilium et breviorum.— erba 
digitalis, annua, simplex, glaberrima ; caule exili paucifoliato cum 
ramis raris glomerulo solitario terminato ; folis alternis squamz- 
formibus oblongis ovatisve amplexicaulibus, supremo majore sæpe 
glomerulo approximato ; involucro e foliis duobus, basi vel ad 
medium usque coalitis. Flores lutei; lana candida. (Nomen ex 
| OiÓvpos, bivalvis, et oréyn, tectum, compositum, ad involucrum glo- 
meruli bivalve alludens.) 
D. amplexicaulis. (Ic. Pl tab. ined.) South-western Australia, 
Drummond, 1850.—This singular little plant, of the division Angian- 
