26 BOTANICAL GAZETTE [JULY 
characters respectively constant. This being true, it seems certain that the 
15 or more beautiful plants collected by Palmer (no. 419), and all of them 
having Lersca 4 elongate, very attenuate achenes, are likewise specifically 
distinct 
Bidens pseudalausensis, sp. nov.—Herba, verisimiliter annua, 
circiter 6 dm. alta (ex Langlassei inscriptione), ramosa; caule et 
ramis tetragonis et acute angulatis, striatis, glabris. Folia opposita, 
petiolata, petiolo adjecto 2~7 cm. longa, 1-5.5 cm. lata, bipinnata, 
glabra; ultimis lobis cuneato-oblanceolatis, dentatis dentibus ad 
apicem induratis; petiolis o.2-2 cm. longis, ad basim connatis, 
Capitula terminalia, tenuiter pedunculata pedunculis 1.5—-6 cm. 
longis, ligulata, ad anthesin 6-7 mm. alta et (ligulis adjectis) 
eirc. 1.5 cm. lata. Involucrum basi glabrum, squamis duplici 
serie dispositis; exterioribus (circ. 8) linearibus, ciliatis, 2-3 mm. 
longis; interioribus paulo longioribus, glabratis, margine diaphanis. 
Ligulae (circ. 5) albae (e Langlasseo), in sicco specimine luteolae, 
striatae, obovatae, ad apicem lobulatae aut obtusissime dentatae, 
§-7 mm. longae. Achaenia (1-3 maturata in capitulis singulis) 
linearia, nigra, faciebus plus minusve glabra, marginibus tuber- 
culato-hispida, biaristata (aristis sub apicem retrorsum hamosis), 
_7-9mm. longa.—Differt a B. alausensi H.B.K. habitu ramoso, etc. 
-_ E. Langlassé 541, at altitude of 580 m., “El Ocote, Cerro Pedregoso, 
Michoacan and Guerrero,” Mexico (type in US. Nat. Herb.). 
- ‘Bidens aequisquama (Fernald), comb. nov.—Bidens rosea 
Schz. Bip. var. aeguisquama Fernald, Proc. Amer. Acad. 43:68. 
1907- 
This rare species differs very markedly from Bidens rosea Schz. Bip., not 
ee only in its involucres but also in its foliage and achenes. The type of B. 
| rosea (Cosmos pilosus H.B.K.) is still extant (in Herb. Mus. Hist. Nat. Paris) _ 
and, though rather i immature, is not separable from such specimens as Heyde 
and Lux 6172 and Palmer 192 i Coes, Proc. Amer. Acad. 41: 
