268 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
In habit this species differs rather conspicuously from its Mexican 
congeners in its very numerous subequal pairs of cauline leaves. a 
Piptothrix jaliscensis, spec. nov. Ramosa glaberrima = : 
cescens, caule tereti laevissimo atropurpureo ; follis oppositis Sum 
sessilibus crassiusculis patentibus vel etiam reflexis ovatis leviter 
serrulatis acutis basi rotundatis 3-nervatis subtus minute reticulatis, 
3-4 cm. longis, 13-20 mm. latis; corymbis parvis ee 
rotundatis, capitulis sessilibus 3—4-floris 8 mm. alltis, involuero cy ans 
drico glaberrimo, squamis circa 7, interioribus subaequalibus ser 
oblongis acutiusculis 3.8 mm. longis, exterioribus multo brevior1 ie 5 
corollis albis ex involucro longe exsertis glabris, tubo proprio grac 1 
faucibus breviter cylindricis subaequante ; achaeniis nigris laevibus 
1.2 mm. longis, pappi setis 10-12 inaequalibus niveis eps 
Mexico: dry rocky mountains above Etzatlan, Jalisco, 1903, C. @. 
Pringle, no, 8764. a 
A plant with the habit of P. pubens, Gray, but readily distin- 
guished from that species by its less pointed and entirely glabrous 
leaves, glaucescent surface, ete. : 
ickellia monocephala, spec. nov. Erecta perennans, rhizo- 
mate crassiusculo horizontali noduloso, caule simplici tereti striato 
tenuiter pubescenti 8 dm. alto ad mediam folioso; foliis alternis 
ovatis graciliter petiolatis integris obtusis basi subcordatis vel sub- 
truncatis ad insertionem petioli breviter acuminatis undique opace 
viridibus puberulis subtus glanduloso- vel resinoso-punctatis 3-D bse 
longis 2.5-3.4 om. latis 3-nervatis; foliis superioribus angustioribus 
bractealibus in pedunculo solitario terminali remotis ; capite pro 
genere permagno 3.8 cm. diametro nutante, involucri campanulatl 
squamis oblongis acutis viridibus externe pubescentibus circa 3-serla- 
tim imbricatis interioribus striato-nervatis ; corollis viride albis tubo 
longo sine ullis faucibus distinctis, limbo perbrevi glabro; styli ramis 
valde clavatis atropurpureis; achaeniis fusco-atris glabris valde 
10-costatis 6 mm. longis, pappi setis 20-25 laete albis subplumosis. 
— Mexico: on hills near El Salto, Hidalgo, 16 September, 1901, alt. 
2150 m., 0. &. Pringle, no. 8621 (type in hb, Gr.). 
A species remarkable for its very large solitary heads, but other- 
wise possessing all the characteristic features of the genus. 
, ia pulcherrima, Spec. nov. Herbacea erecta, caule 
tereti striatulo purpureo crispe albo-puberulo ; foliis anguste lanceo- 
latis superne alternis conduplicatis patentibus vel reflexis integris 
