



1920] * SHERFF—BIDEXS 107 



\ 



chaud's original plate was only a crude representation, and that 

 hence the delineation of foliage, etc., given there must not be inter- 

 preted very literally. Consequently, various other species have 

 been referred arbitrarily to B. micrantha to such an extent that 

 I references in literature to B. micrantha Gaud, are almost entirely 



^ untrustworthy. In studying the recent collections from the 



Hawaiian Islands, I was impressed with the resemblance of a cer- 

 tain plant (G. C. Munro 602, see later) to Gaudichaud's illus- 

 tration. The leaves possessed the same peculiar outlines as in 

 the drawing. A careful study of the plant showed that it was posi- 

 tively the true B. micrantha. Several other plants that, while 

 arying in various minor details from this plant, were seen to belong 

 nevertheless with it specifically, were then assembled. From this 

 small group of specimens I have been able to draw up the following 

 amplified description. 



Bidens micrantha Gaud., descript. amplificat. — Frutex glabra, 

 caule plus minusve rubido, 6-9 dm. alta. Folia gracilia, crassius- 

 cula, irregulariter 3-5-foliolata aut summa simplicia, petiolis 

 adjectis 4-13 cm. longis, foliolis anguste lanceolatis, acuminatis, 

 utroque latere paucis dentulis ad medium serrato, 2-5 cm. longis et 

 4-12 mm. latis, petiolis 1.5-5 cm. longis. Capitula numerosa, 

 paniculata aut corymbosa, ligulata, ad anthesin 4-6 mm. alta 

 et 1 . 5-2 cm. lata, pedicellis tenerrimis 1-2 . 5 cm. longis. Involucri 

 bracteae exteriores lineares, re^ino-pubescentes aut glabratae, 

 minimae (circ. 1 .5 mm. longae), bracteis interioribus multo minora. 

 Ligulae 3-5, anguste oblongae, flavae, saepe ad apicem obscure 

 dentatae, circ. 1 cm. longae. Achaenia linearia, nigra, compressa, 

 recta vel torta, facie et marginibus plerumque glabra, 7-10 mm. 

 longa, apice nunc exaristata et setosa, nunc breviter biaristata aut 

 etiam (marginibus excurrentibus sub apicem) irregulariter quadri- 

 aristata, aristis glabris aut retrorsum hispidulis. 



Specimens examined. — M. /. Remy 281, Hawaii, 1851-1855 (Herb. Gray; 

 Herb. Mus. Hist. Nat. Paris; type material oi* Bidens Remyi Drake del Cast. 

 on nobis; Coreopsis Remyi Drake del Cast.); C. N. Forbes 14 H.. Puuwaawaa, 

 Hawaii, June 8-14, 1911 (Herb. Bishop Mus.); idem 326 Mo., ridge and foot of 

 Lahainaluna Valley, Maui. February 1913 (Herb. Bishop Mus.); G. C. Munro 

 602, ridge to Puu Kukui, Maui, September 26, 1916 (Herb. Bishop Mus.; one 

 of the achenes was 3-awned!); idem 122, Waiapaa, Lanai, September 26, 1913 





