319 
gati, sulcati, glabri. Peduncuius communis masculus (imperfecte evolutus) subnul- 
lus; pedicelli erecto-patuli, capillares, 2-3 mm. longi. Flores feminei brevissime 
pedunculati. Calycis tubus basi truncatus, apice paulo dilatatus, 8 mm, longus, 1-14 
mm. latus; dentes flexuosi, 3 mm. longi. Petala patula vel subreflexa, basi leviter 
dilatata, superne subulata, 6 mm. longa. Ovarium oblique ovoideo-oblongum, longis- 
sime denseque hirsutum, 3-4 mm. longum. Fructus maturus ignotus. 
Dr, E, Palmer. No. 1600. Lodiego, October 9 to 15, 1891. 
Sicyos echinocystoides Cogn. (sect. Eusicyos); foliis breviuscule petiolatis, 
ambitu late cordato-ovatis, obscure vel leviter 3-5-lobatis, utrinque scaberrimis, lobis 
triangularibus vel subrotundatis, nervis lateralibus imum sinum non marginantibus; 
cirrhis trifidis; racemis masculis simplicibus, 15-25-floris, folio satis longioribus; 
calycis dentibus brevissimis; pedunculis femineis apice 4-5-floris; fructibus valde 
inequalibus, plurisque parvis abortivis, sepius uno tantum bene evoluto, ovoideo, 
satis compresso, obtusiusculo, vix puberulo et setis elongatis persistentibus densius- 
cule vestito, , 
Rami gracillimi, suleati, brevissime subsparseque glanduloso-puberuli. Petioli 
satis graciles, striati, brevissime denseque glanduloso- puberuli, inferiores 3-4 em. 
superiores siepius vix $ em.longi. Folia tenuiter membranacea, lite viridia demum 
pallidiora, margine minime remoteque denticulata, 8-12 cm. longa, 7-10 em. lata, 
superiora multo minora; nervi subtus paulo prominentes; sinus basilaris angustus, 
1-2) em. profundus, Cirrhi satis graciles, longiusculi, sulcati, brevissime sparseque 
glanduloso-puberuli. Pedunculus communis masculus gracilis, striatus, brevissime 
et densiuscule glanduloso-puberulus, circiter 1 dm. longus, usque ad medium flori- 
ferus; pedicelli filiformes, patuli, 5-8 mm. longi. Calycis tubus subrotatus, sub- 
glaber, 24 mm. latus; dentes patuli, triangulari-subulati, vix 1mm. longi. Corolla 
spurco-alba, vix puberula, segmentis patulis, triangularibus, acutis, 5-nerviis, 4 
mm. longis, basi 2 mmm. latis. Columna staminea capillaris, 24mm. longa; anther 
conniventes, }inm. longie. Flores feminei quam imasculi multo minores. Pedunculus 
fructiferus 1-14 em. longus. Fructus fuscescens, basi rotundatus, 10-11 min. longus; 
setie d-9 mmm. longer, basi interdum tuberculatie. 
Species 8. deppei G. Don proxima. Dr. E. Palmer. No. 1894. Tepic, 1892. 
Tridax tenuifolia Rose, sp. nov. 
Annual, 6 to 9 dm. high, erect and somewhat simple, or spreading and much 
branched, slightly hispid throughout but not glandular; leaves opposite, thin, ovate- 
lanceolate, sharply and more or less strongly serrate, acute, cuneate at base, LO cm, 
or more long including the slender petioles, rather variable in size, & to 12 mm. high; 
involucre double; outer bracts 5, green, oblong, acuminate, strongly striate; inner 
bracts scarious, equal to the outer; palew of the receptacle shortly acuminate; rays 
white; bristles of the pappus white. Type specimens collected by Dr. Edward 
Palmer on mountain sides above Batopilas, State of Chihuahua, Mexico, August to 
November, 1885 (No. 180) and distributed as 7. bicolor, Proc, Amer. Acad. xxi, 391 
(in part), 433. Type specimen deposited in the National Herbarium. 
This species is quite distinet from 7. bicolor, It differs in the texture and shape of 
the leaves, in the involucral bracts, color of the rays, the acumination of the chaff, 
the color and length of the pappus, and the shape of the disk corollas. 
Dr, Palmer has also collected near Lodiego (October 9 to 15, 1891, No. 1611) a very 
similar plant with smaller heads, slightly different disk corolla, which I here desig- 
nate variety microcephala. Future study may show that the two are distinct. 
THREE UMBELLIFER. OF THE WESTERN UNITED STATES. 
One of the most puzzling of our American Umbelliferze outside of 
some of the Rafinesquian species has been the Angelica verticillata of Sir 
William J. Hooker. He published this species in 1847 as a doubtful 
