CHAPTALIA. 197 
light and thin tomentum: scapes stout, a foot high, naked, 
flocculent : involucre large, many-flowered, almost hemispherical 
at flowering, bracts very narrow, numerous: achenes minutely 
and sparsely pubescent along the ribs, and more minutely gran- 
ular-scaberulous between them; stipe of pappus filiform, very 
long. 
Bolivian species; Rusby’s n. 1677 from Mapiri and Bang’s 
237 from Yungas, both as in U. S. Herb. 
Icianthus and Sprengeria. 
Under these names I am about to propose two other genera of 
Cruciferae. 
IcIANTHUS has for its type species what Hooker named Strep- 
tanthus hyacinthoides, a Texan annual which, in the Torrey and 
Gray Flora, was mistakenly appended to that section of Strep- 
tanthus to which Nuttall has assigned the generic or subgeneric 
name £uciista ; a group marked by many characters of the calyx 
and corolla, and to which the type now in hand can by no means 
rationally be referred, its calyx not being thin, or inflated, or in 
the least degree bilabiate. In IcIANTHUS the calyx is (1) not 
in the least inflated, (2) its sepals are thick and fleshy, (3) 
straight to their tips, (4) forming a regular calyx (5) none of the 
sepals connivent at apex. The petals have (6) not the broad 
and deeply channelled claw, nor (7) the short and somewhat 
rounded limb of Zucdisza. 
The species of IcIANTHUs are perhaps several, and more than 
are here indicated. 
I. HYACINTHOIDES. Sitreptanthus hyacinthoides, Hook. Bot, 
Mag. t. 3516. Zuclisia hyacinthoides, Small, Fl. 485 in part 
Species exclusively Texan, bearing long loose racemes of rather 
small nodding flowers of a dull greenish purple. 
I. GLABRIFOLIUS. Strepianthus glabrifolius, Buckley, Proc. 
Philad. Acad, 1861, p. 448 must needs be distinct by its short. 
crowded racemes of quite large flowers said to be rose-purple. 
