Tetramolopium.| ; COMPOSITAE. 197 
Disk-fl. always fewer, in some species very few, hermaphrodite, sterile in 
the distinctly radiate heads, fertile in the subdiscoid ones, their corollae 
purplish, slender, funnel-shaped or tubular, 5-fid. Anthers apiculate, 
obtuse at the base. Style-branches of the disk-florets short, flat- -cOnVeX, 
with subulate apex. Achenes compressed, with stout marginal nerves 
and a weaker, rarely evanescent, median nerve on each face. Bristles of 
pappus capillary, scabrous, of even length, in one or two rows, about 
equalling the disk. — Low shrubby plants, resiniferous or viscous, dicho- 
tomously or verticillately raiaiiie from near the apex of the last season's 
growth, so as to include the old inflorescence in the fork or whorl. Leaves 
alternate, crowded along the youngest branches. Flower-heads single, 
several or many, on ae rarely on dividing peduncles, which rise from — 
the ends of the branch 
A Hawaiian genus bor rea bape Be peatagiae and the Australian Vittadinia 
but to be distinguished fro: by the 3-serial involucre, the subu la te s style- 
di tved faces of the ac 
, 0 ” 
nerves are often so weak hey become visible only at the base, regia would seem 
to be sufficient ground for Saeiedtetie the phylogenetic unity of all our species 
Faces of achenes often nerveless ri : : : 3. T. humile. 
Faces of a chenes always with a median z 
A ala flower-head at the end of each pectin 1c exserted : : 
Leay se a needle-shaped, acerose T. Remyi. 
T. tenerrimum. 
Sr 
Leaves linear or linear-spathulate, membran 
Several 1 Hower heads in an inflorescence gore not or scarcely 
exserted : 
Disk. florets severa Sake! bg 
cuspid or s y serra 
Leaves, at — es lowest, tricusp arp. Oe ae 
den 
Leaves all e ntir ee sas 
= bracts ont voc aogurdinenaad 5. T. consanguts 
bracts = ite, 6. T. arenarium. 
7. T. conyzoides. 
Disk- phe only 1 
1. T. Remyi, Gray, Proc. Am. Ac. V, 119 (sub Vittadinia). — Ex 
quite woody, 1/2—11/2 ft. high. Leaves stiff needle-shaped, 'j2—1’, cay 
nelled, inyolute above, scabrous. Peduncles single at the ends of ee 
branches, 1—4! long, with several remote 8 mall filiform men’ — or in 
into the seat Heads 6—8“ in diam. Inyol. scales linear-acute, one 
third shorter than the Pe Receptacle slightly convex. Ray and disk 
_ distinct. Disk-fl. about 60, purple, se a! sien, ‘fannel-shaped. Ray-fl. 
t 150, white, in two series, exserted, 3—4“ long, their ligules twice 
