rusty indumentum on the under surface of the leaf serves 
to distinguish Conomorpha riparia at once from C. grand- 
flora, which has entirely glabrous leaves. 
Conomorpha riparia is a slight treelet and, growing on 
the very edge of the deeply inundated banks, is subject 
each year to tremendous drowning. The specific epithet 
refers to its habitat along the banks of the river. 
Cotomsia: Comisaria del Vaupés, Rio Negro, at confluence of Rios 
Guainia and Casiquiare, Cafio Ducuruapo (Igarapé Rana). ‘‘Bush. 
Flowers yellow, fragrant. Along flood-bank.’’ December 13-17, 1947, 
Richard Evans Schultes & Francisco Lépez 9347 (Tyre in Herb. Gray). 
Cybianthus Duckei R. E. Schultes sp. nov. 
Arbor parva ut videtur bene frondosa. Ramuli crassi- 
ores, prope apicem sparse ferrugineo-lepidoti, cortice 
stramineo. Folia chartacea, robustiore petiolata (petiolis 
15-20 mm. longis, 2 mm. in diametro), elliptica, apice 
acuta ut videtur, basi cuneata, margine integra et leviter 
revoluta, plerumque 20-24 em. longa, 7—8.5 cm. lata, 
supra atroviridia, subtus pallidiora et minutissime sub- 
tessellata, omnino glabra; nervis lateralibus decem ad 
quattuordecim, subtus prominentioribus. Inflorescentiae 
multiflorae, laxe bipinnatim paniculatae, foliis subae- 
quales, axibus densiore-ferrugineo-lepidotis; bracteis mi- 
nutis, 0.7 mm. longis; pedicellis 2-4 mm. longis. Flores 
(ex collectore) albi et intus leviter rosei, 2 mm. in dia- 
metro vel minores. Sepala basi breviter connata, lobis 
ovatis vel suborbicularibus, apice obtusis, margine irregu- 
laribus (sed non pilosis et non crenatis), 1.4 mm. longis, 
circiter 1 mm. latis; punctis magnis brunneis praeditis. 
Petala 4 pro parte connata, ovato-lanceolata, apice rotun- 
data, marginem versus valde hyalina, plusminusve 2.5 
mm. longa, 1.8 mm. lata, utroque cum duobus maculis 
rufo-brunneis. Stamina petalorum prope basim, 2 mm. 
longa, petala paulo superantia; antherae 0.8 mm. longae, 
0.5 mm. in diametro; filamenta basi dilatata, crassiora, 
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