182 -Rhodora [OCTOBER 
juga dorsalia filiformia obscura. Vittae conspicuae fuscae ad valle- 
culas solitariae fructus partem seminiferam longitudine aequantes, 
vittae commissurales 2. Stylopodium ad anthesin cylindratum 
humile, ab fruetu deest. Carpophorum liberum bipartitum. Semen 
complanatum.— Herba perennis. Folia omnia alterna ternatim 
decomposita. Umbellae terminales. Involucrum nullum. Bracteae 
involucellorum lineari-subulatae pedunculos aequantes. 
Calyx 5-toothed, the teeth sunken and inconspicuous on the mature 
fruit. Petals linear-oblong, emarginate, quickly deciduous. Stamens 
dorsifixed. Fruit obovate, emarginate, strongly compressed dorsally, - 
glabrous; with broad thin, wing-like lateral ribs; the dorsal ribs 
filiform, obscure. The intervals each with one large, dark-colored, 
conspicuous oil-tube, running the full length of the body of the meri- 
carp; the commissural face with two oil-tubes. Stylopodium on 
young flowers low, cylindrical, wanting on the fruit. Carpophore free, 
two-cleft. Seed fat.— A perennial herb. Leaves all alternate, 
ternately dissected. Umbels terminal. Involucre none. Involucels 
linear-subulate, as long as the peduncles. 
Phanerotaenia belongs in the Peucedaneae of Bentham and Hooker's 
and of Drude's treatment of the family. "There are no related genera 
with which it could be confused.  Oxypolis, S phenoscadium | and 
Heracleum all differ in having conical stylopodia, while Phanerotaenia 
has the stylopodium wanting on the mature fruit. Eurytaenia 
has a depressed stylopodium, 3-cleft or pinnately dissected involucels 
and involucral bracts, and pinnately dissected leaves, whi'e Phanero- . 
taenia, with no stylopodium on the mature fruit, has simple involucels, 
no involucral bracts, and ternately dissected leaves. Lomatium is 
acaulescent, has the lateral wings adherent till maturity, 1-% oil-tubes 
in the intervals and 2-10 on the commissural side, while Phanerotaenia 
is caulescent, has the lateral wings free before maturity, oil-tubes single 
in the intervals, and 2 on the commissural side. Euryptera is acaules- 
cent or nearly so, has the fruit cordate or emarginate at base, the 
lateral wings coherent till maturity, the oil-tubes 1-c in the intervals, 
the leaflets broad or broad in outline, while Phanerotaenia is cau- 
lescent, has the fruit cuneate or rounded, not emarginate at base, the 
lateral wings free before maturity, the oil-tubes singlein the intervals, 
and the leaflets bluntly serrate. 
PHANEROTAENIA texana (C. & R.) n. comb. Polytaenia Nuttallii 
DC., var. texana C. & R., Contrib. U. S. Nat. Herb. vii. 192 (1900) ; 
Pleiotaenia nuttallii texana C. & R., Contrib. U. S. Nat. Herb. xii. 448 
(1909). Caulescent perennial, rising from a deep tap-root, 5-10 dm. 
