378 RYDBERG: SOME SENECIOID GENERA—I 
The species are all North American and have been treated 
by Small in his Flora of the South Eastern United States with 
the exception of Mesadenia Elliottiit R. M. Harper* and the 
following species: 
/ Mesadenia angustifolia Rydberg sp. nov. 
Cacalia lanceolata ? Ell. Bot. S. C. & Ga. 2: 311. 1824. 
Not C. lanceolata Nutt. 1818. 
Mesadenia lanceolata Small, F1. SE. U.S.1301,in part. 1903. 
Stem terete, glabrous, 5-15 dm. high; lower leaves petioled, 
the upper sessile : petioles of the lower leaves 5-15 cm. long; 
blades narrowly lanceolate, 1 1-2 dm. long, less than 2 cm. wide, 
3-ribbed or indistinctly 5-ribbed, often glaucescent beneath, 
entire or distantly sinuate-dentate, acuminate; upper leaves 
reduced, linear or lance-linear, less than 1 cm. wide, acute or 
more commonly acuminate; involucre 9-10 mm. high, 4 mm. 
road; bracts linear-oblong, acute, slightly scarious-margined ; 
corolla-tube 4-5 mm. long; throat 1.5 mm. long; lobes lance- 
inear, 3 mm. long; achenes — 5 mm. long, Seaplrely ribbed; 
pappus-bristles 6-7 mm. lon 
Type collected in the Riccio! between Fort Lauderdale 
and Miami, 1911, Small, Carter & Small 3318 (herb. N. Y. 
Bot. Gar 
DISTRIBUTION: Throughout Florida to southern Georgia and 
Louisiana. 
THE NEw York BotANIcaL GARDEN 
* Torreya 5: 184. 1905. 
