496 BOTANICAL GAZETTE [june 



alta, ligulata. Involucrum basi plus minusve hispidum; squamis 

 duplici serie dispositis et demum rcflcxis; exterioribus (circ. 6) 

 linearibus, apiculatis, subsparsim pubescentibus, 1-2 mm. longis; 

 intcrioribus lanceolatis, mcmbranaceis, 2-3 mm. longis, margine 

 diaphanis. Ligulae (6 aut pauciores) lanceolatae, 4-5 striatae, 

 apice intcgrae, 3-4 mm. longac, in sicco specimine subalbae. 

 Paleae lineares, margine diaphanae. Achaenia attenuato-linearia, 

 supra sparsim hispida, biaristata aristis glabris aut retrorsum 

 1-3-hamosis, (interiora) demum 0.8-1 cm. longa. 



Ed. Andre 2878, at altitude of 1250 m., Rio Juanambu, United States of 

 Colombia, April 28, 1876 (type in Herb. Gray). 



The 20-30 areolae on the old disks become prominent as the involucres 

 reflex. There are 37 heads on the type specimen. The plant appears to be 

 entirely herbaceous, but the label says "suffrutesc," hence the lower part of 

 the plant (not present on the sheet) may have been woody and perennial. 



Bidens mirabilis, sp. nov. 1 — Herba volubilis glabra, caule sub- 

 tereto, striate Folia caulis petiolo adjecto 8-10 cm. longa, pin- 

 nata, foliolis irregulariter 3- vel 5-partitis, segmentis (ad marginem 

 sparsun hispidis) ovatis et integris aut ad apicem 1-5 dentatis, 

 petiolis 3-3.5 cm. longis; folia ramulorum parva, integra aut ter- 

 nata. Capitula (floribus flavescentibus e Sprucei inscriptione) 

 multa, parva, dense paniculata, discoidea, 3-5 mm. lata, 4-5 mm. 

 alta. Involucrum glabratum, squamis duplici serie dispositis; 

 exterioribus lineare-lanceolatis, laciniato-ciliatis, 1.5-2.5 mm. 

 longis. Paleae lineares, 4-5 mm. longae, marginibus diaphanis. 

 Stilorum rami breves, crassi, plus minusve obtusi. Achaenia late 

 cuneato-lanceolata, plana, margine lobulata, lobulis coronatis 1-4 

 longis pilis; constricta ad apicem cervice crassa, 8-10-aristata 

 aristis inaequalibus et retrorsum hamosis. 



Spruce 6273, Huambalpa, Andes Mountains, Feru ("Andes Quitenses, loco 

 Huambalo"), November 1S57 (type in Herb. Kew). Plate XXXI. 



This is a very strange species and one that might be taken by some to 

 represent a new genus; indeed, I know of no other species of Bidens combining 



1 Dr. J. M. Greenman (now of the Missouri Botanical Garden), to whom I shall 

 express more extended thanks later for having inspired my research upon the genus 

 Bidens and directed it during its early stages, and Dr. B. L. Robinson (of Gray Her- 

 barium) have very kindly assisted me with certain library and herbarium data for this 

 species. 



