268 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
i 
In habit this species differs rather conspicuously from its Mexican 
congeners in its very numerous subequal pairs of cauline leaves. 
Piptothrix jaliscensis, spec. nov. Ramosa glaberrima glau- 
cescens, caule tereti laevissimo atropurpureo; foliis oppositis sub- 
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 terrninalibus 
rotundatis, capitulis sessilibus 3—4-6oris 8 mm. altis, involucro cylin- 
drico glaberrimo, squamis circa 7, interioribus subaequalibus lineari- 
oblongis acutiusculis 3.8 mm. longis, exterioribus multo brevioribus; 
corollis albis ex involucro longe exsertis glabris, tubo proprio gracili 
faucibus breviter cylindricis subaequante; achaeniis nigris laevibus 
1.2 mm. longis, pappi setis 10-12 inaequalibus niveis caducis.— 
Mexico: dry rocky mountains above Etzatlan, Jalisco, 1903, C. G. 
Pringle , no. 8764. 
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, etc. 
Brickellia 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—5 cm. 
longis 2.5—3.4 cm. latis 3-nervatis; foliis superioribus angustioribus 
bractealibus in pedunculo solitario terminali remotis; capite pro 
genere permagno 3.8 cm. diametro nutante, involucri campanulati 
squamis oblongis acutis viridibus externe pubescentibus circa 3-seria- 
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., C. G. 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. 
Brickellia pulcherrima, spec. nov. Ilerbacea erecta, caule 
tereti striatulo purpureo crispe albo-puberulo ; foliis anguste lanceo- 
latis superne alternis conduplicatis patentibus vel reflexis integris 
