622 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



Range: Mountains of Colorado, New Mexico, and Arizona. 



New Mexico: Cowles; Gallinas Planting Station; Las Vegas Hot Springs; West 

 Fork of the Gila; Fresnal. Transition Zone. 



5. CICHORITJM L. Chicory. 



Erect branching herbaceous perennial with basal and alternate cauline leaves and 

 large heads of blue flowers in sessile clusters along the branches; involucre of 2 series 

 of herbaceous bracts, the outer spreading, the inner erect; achenes 5-angled, truncate; 

 pappus of 2 or 3 series of short blunt scales. 



1. Cichorium intybus L. Sp. PI. 811. 1753. 

 Type locality: "Habitat in Europa ad margines agrorum viarumque." 

 New Mexico: Near Albuquerque (Munson & Hopkins). 

 A common weed in many parts of the United States but, eo far, rare in New Mexico. 



6. UROPAPPUS Nutt. 



Acaulescent annual, with narrow, entire or laciniate-toothed leaves and medium- 

 sized heads of yellow flowers; involucre of a series of narrow inner bracts and a few 

 calyculate outer ones; achenes attenuate to a short beak; pappus white, of 5 scarious 

 awn-tipped scales. 



1. Uropappus pruinosus Greene, Leaflets 1: 213. 1906. 

 Type locality: "Southwestern New Mexico and adjacent Arizona." 

 Range: Southern New Mexico and Arizona. 

 New Mexico: Nutt Mountain; Organ Mountains. Lower Sonoran Zone. 



7. LACTUCA L. Lettuce. 



Tall or low perennial or biennial herbs with milky juice, leafy stems, and paniculate 

 inflorescence of small heads of blue or yellow flowers; involucre glabrous, cylindric, 

 of few subequal bracts in a single series and numerous calyculate outer ones; achenes 

 compressed, beaked; pappus of usually white, slender bristles falling separately. 



KEY TO THE SPECIES. 



Achenes not transversely rugulose. 



Flowers yellow; leaves spinulose 1. L. integrata. 



Flowers blue; leaves not spinulose 2. L. pulchella. 



Achenes transversely rugulose. 



Leaves spinulose on the margins and midribs 3. L. ludoviciana. 



Leaves never spinulose. 



Involucre about 10 mm. high; leaves mostly pinnatifid, 



with broad lobes 4. L. canadensis. 



Involucre 15 to 20 mm. high; leaves mostly entire, linear, 



or the lowest with narrow lobes 5. L. gramini/olia. 



1. Lactuca integrata (Gren. & Godr.) A. Nels. in Coulter, New Man. Rocky Mount. 



596. 1909. Prickly lettuce. 



Lactuca scariola integrata Gren. & Godr. Fl. France 2: 320. 1850. 

 Type locality: France. 



New Mexico: Farmington; Shiprock; Mesilla Valley; Gilmores Ranch; Ruidoso. 

 Introduced from the eastern States and originally from Europe, this has become a 

 troublesome weed in some of the river valleys of New Mexico. 



2. Lactuca pulchella (Pursh) DC. Prodr. 7: 134. 1838. 

 Sonchus pulchellus Pursh, Fl. Amer. Sept. 502. 1814. 

 Lactuca integrifolia Nutt. Gen. PI. 2: 124. 1818. 



