V. PLANTS WRIGHTIANtE. 119 



367. Thymophylla Greggii, Gray, PI. Fendl. p. 91, adnot. ; var. radiata. (Tab. 

 VII.) — Rocky banks of streams east of the Guadalupe Mountains, and on the Pecos, 

 Oct. ; growing in large bunches. — Excepting the rays, which are uniformly present 

 in these specimens, I find nothing to distinguish this from Dr. Gregg's plant, in 

 which no rays are to be detected. No. 284 in Dr. Gregg's collection of 1848, 1849, 

 from Buena Vista, also rayless, is T. setifolia, Lagasca, as also is No. 445 of Coul- 

 ter's collection, from Zimapan. A flower of this species is added to Plate VII., to 

 show the pappus of five or six separate palete, as characterized by Lagasca. In 

 T. Greggii these are united into an entire, or sometimes slightly lobed, crown or 

 cup. The Ipwer leaves in both are pinnately 3 - 7-parted. 



368. Chrysactinia Mexicana, Gray, PI. Fendl. jy. 93, adiiot. Rocky banks of 

 streams east of the Guadalupe Mountains ; Oct. " Only a few specimens seen." 

 Also in the collection of 1851. — The distinction between the divisions Tagetese 

 and Porophyllete is annihilated by this plant, which has the rays of the former and 

 the pilose pappus of the latter ; as it likewise is by the genus Nicolletia, which has 

 both a pilose and a paleaceous pappus in the same flowers. I subjoin the characters 

 of the latter genus, now confirmed by the discovery of a second species, as they have 

 been published only in a volume which is not so well known to botanists as it 

 should be.* 



369. PoROPHYLLUM scopARiuM (sp. uov.): ramis e basi fruticosa erectis rigidis 

 superne nudiusculis ; foliis involutis filiformibus glandulis parcis vel nuUis apice 

 calloso-mucronatis ; involucri campanulati brevi squamis 8 oblongo-linearibus con- 

 cavis obtusis coriaceis viridibus parce glanduloso-lineatis ; acheniis erostratis pube- 



* NICOLLETIA, Gray in Frem. Rep. Exped. 2. p. 315. 



Capitulum heterogamum multiflorum ; ligulis foemineis ; corollis disci tiibulosis eeqiiaiiter 5-dentatis. 

 Involucrum campanulatum e squamis 8-12 membranaceis liberis. Receptaculum convexum favosum. 

 Styli rami florum radii appendice angusta glabra, disci appendice elongata filiformi hispida, superati. 

 Achenia lineari-elongata, subteretia, puberula. Pappus duplex ; exterior e seti* pluribus capillaribus den- 

 ticulato-scabris ; interior e paleis 5 lanceolatis hyalinis, nervo in aristam scabram producto. — HerbaB 

 nance, annuse, glabrce, odore baud ingratEB ; foliis pinnatipartitis plerisque alternis, lobis saspius grosse 

 uniglandulosis ; capitulis majusculis terminalibus ; floribus rubicundis } 



1. N. occiDENTALls {Gray,l.c.): caule crassiusculo ; foliis subcarnosis, lobis brevibus ; involucre 

 niultifloro basi folioso-bracteato, squamis 10-12 oblongis subbiserialibus ; pappi paleis lanceolatis e basi 

 sensim angustatis arista brevi superatis. — Sandy banks of the Mohave River in llie interior of California, 

 Fremont. 



2. N. Edwaedsii (sp. nov.) : caule exili ; lobis foliorum filiformibus elongatis ; involucro anguste cam- 

 panulato 25-floro basi squamulis ovato-subulatis parce bracteato, squamis 8 lanceolatis uniserialibus : pappi 

 paleis ovato-lanceolatis arista gracili superatis. (Tab. VIII.) — Near Guajuquilla, Chihuahua, Mexico, 

 Aug., Dr. Edwards. Described and figured from a specimen in Dr. Torrey's herbarium. — The plant is 

 an annual, three inches high, with the heads only half as large as those of N. occidentalis. The flowers 

 are said to be pink-colored. Each lobe of the leaves bears, towards its tip, a single very large gland ; and 

 there are a few in the scales of the involucre. The inner palese of the pappus are not unlike those of 

 Adenophyllum ; but in place of the five cuneiform and truncate palese we have a series of 20 to 40 very 

 slender capillary bristles, as long as the palese, and somewhat clustered alternate with and exterior to them, 

 so that on tearing off a palea two small clusters of bristles, one on each side of its base externally, are de- 

 tached with it. 



