206. 
Eclipta 
Eclipta alba (L.) Hassk. 
Java Farm. One station: growing in rotted stump beside tidal 
portion of Muddy Creek, near upstream limit of salt marsh vegetation. 
Hectare 3413. Accessable only by boat at high tide. Associate species: 
Pluchea camphorata, Scirpus validus, Smilax rotundifolia, Typha 
latifolia. Higman 258. 
Bidens 
1. Primary leaves bi- or tri-pinnate; achenes linear, 
very unequal, the inner 2 to 3 times as long as the outer 
and inner, InVOLUCTE.. . eee cece eeveceresssesvsceseencees Be bipinnata 
1. Primary leaves once-pinnate or simple; achenes 
broadened from base to summit, the inner not over 
1/3 longer than the inner involucre. 
2. Primary leaves simple or with 3 to 5 coarse 
lobes, without distinct leaflets. 
3. Achenes with a convex cartilaginous summit. 
Expected (B. laevis, B. cernua). 
3. Achenes truncate or concave at summit, 
not cartilaginous. 
4, Mature central achenes strongly 4-angled. 
(Also, leaves undivided or with divergent 
basal lobes; phyllaries ascending or 
looselly jspreading))4. severe» sere cineiniese ose soe Be CONNata 
4, Mature central achenes flattish, with slender 
or obscure midribs. Expected (B. comosa). 
2. Primary leaves deeply pinnate-divided or with 
distinct leaflets. 
5. Rays wanting or shorter than outer involucre; 
leaflets uncleft. Expected (B. frondosa). 
5. Rays showy, conspicuously longer than outer 
involucre; leaflets pinnately incised or 
coarsely serrate. 
