WOOTON AND STANDLEY FLOEA OF NEW MEXICO. 499 



KEY TO THE SPECIES. 



Plants low, less than 15 cm. high; flowers small, the corolla lobes 



much shorter than the tube; anthers oblong 1. C. texense. 



Plants larger, usually more than 20 cm. high; flowers large, the 

 corolla lobes only slightly shorter than the tube; anthers 

 linear 2. C. calycosum. 



1. Centaurium texense (Griseb.) Fernald, Rhodora 10: 54. 1908. 

 Erythraea texensis Griseb. in DC. Prodr. 9: 58. 1845. 



Type locality: "In rep. Texas pr. S. Felipe." 



Range: Texas to southeastern New Mexico. 



New Mexico: White Sands (Wooton & Standley). Lower Sonoran Zone. 



2. Centaurium calycosum (Buckl.) Fernald, Rhodora 10: 54. 1908. 

 Erythraea calycosa Buckl. Proc. Acad. Phila 1862: 7. 1863. 



Type locality: North of Fort Mason, Texas. 



Range: Texas to Arizona. 



New Mexico: Carrizo Mountains; Farmington; Gila Hot Springs; Mesilla Valley. 

 Wet ground, in the Lower and Upper Sonoran zones. 



A plant with white flowers was collected at Mesquite Lake (Wooton & Standley 

 3933). 



2. EUSTOMA Salisb. 



Glaucous perennial, often 60 cm. high, with opposite entire sessile clasping thick 

 leaves and large bluish flowers; calyx 5-parted (rarely 6-parted), with narrow keeled 

 lobes; corolla campanulate-funnelform, with deeply 5 or 6-lobed limb; anthers 

 oblong, versatile, recurved in age; ovary 1-celled, the ovules numerous. 



1. Eustoma russellianum (Hook.) Griseb. in DC. Prodr. 9: 51. 1845. 



Lisifinihiis (jhnicifolius Jacq. err. det. Nutt. Trans. Amer. Phil. Soc. n. ser. 5-: 197. 

 1837. 



Lisianlhus russellianus Hook. Curtis's Bot. Mag. 65: /;/. S626. 1839. 



Type locality: "On the sandy banks of the Great Salt River of Arkansas." 



Range: Nebraska and Colorado to New Mexico and Louisiana; also in .Mexico. 



New Mexico: Sabinal; Shalam; White Sands; Tularosa Creek; Roswell. Alkaline 

 soil, in the Lower Sonoran Zone. 



A form with white flowers is common about the White Sands. 



3. HALENIA Borkh. 



Low annual, 10 to 20 cm. high, with linear opposite leaves and loose cymes of small 

 yellow 1 mi ions How. rs; sepals linear lanceolate; corolla 8 to 10 mm. long, the lobea 

 ovate; spurs divaricate-ascending, shorter than the corolla. 



1. Halenia rothrockii A . Gray, Proc. Amer. Acad. 11:84. 1876. 

 Type locality: Mount Graham, Arizona. 

 Range: Southern Arizona and New Mexico to .Mexico. 

 New Mexico: Mogollon Mountains (Rushy 264). 



4. FRASERA Wall. DbBb'b BARS. 1 



Biennial or perennial herbs with tall erect hollow stems ami entire, opposite Of 

 a erticillate Leaves; flowers numerous, in paniculate or thyreoid cymes; calyx i lobed, 

 the lobes narrow; corolla rotate, 'lull whitish or yellowish, with I lobes and I or - 

 [ringed nectariferous glands; stamens (, adnate to the throat of the corolla; filaments 

 distinct, o r united at the base, the anthers versatile; ovarj i celled, 2-valved; capeule 

 ovoid, Leathery, often flattened; Beeds Battened, margined or winged. 



1 A tram lation of the Navaho name. 



