LOASA FAMILY 571 



Petal-like staminodia none; petals 5. j-ellow; a few of the outer filaments slightly dilated 

 atem glabrous or nearly so, white and shining; upper stem-leaves neither with a broad 



base, nor long-acuminate. 17 ;v" laevicaulis 



Stem pubescent throughout, straw-colored, rather dull; upper stem-leaves lone- 



acununate and with a broad base. 



Petals 5-7 cm. long; leaves coarsely hirsute-scabrous. 18. 2V. acuminata, 



i'etals 2.5-3 cm. long; leaves finely scabrous-puberulent. 19. N. vartiflora, 



1. N. lutea Greene. Stout biennial, 6-9 dm. high, with a fusiform fleshy 

 root; lower leaves sinuate-pinnatifid, the upper sinuate-dentate; petals elliptic, 

 short-clawed, acute; petaloid staminodia about three-fourths as long; capsule 

 thick-walled. Mentzelia lutea Greene. Alkaline soil: Colo. SubmonL S. 



2. N. inulticaulis Osterhout. Much branched perennial; sterna many, 

 white, shining, 2^ dm. high; lower leaves pinnatifid, with oblong divisions; 

 flowers opening at sundown; sepals lanceolate, acuminate, 1 cm. long; petals 

 spatulate, 17-20 mm. long; petaloid staminodia about half as large; capsule 

 fully 1 cm. long; seeds smooth, margined. T. muUicaiilis Osterhout. Drv soil: 



Colo. Submont. Je-Jl. 



3._N, multiflora (Nutt.) Greene. Corymbosely branched perennial or 

 biennial; stems bright white and shining, scabrous-puberulent, 3-6 dm. high; 

 petals spatulate, 12-20 mm. long; petaloid staminodia slightly smaller; capsule 

 15-20 mm. long, acute at the base. Bartonia multiflora Nutt. Dry plains: w 

 Tex. — Colo.— Ariz .—Utah — Mex. SubmonL— Moni, Ai)-S. 



4. N. lobata Rydb. Perennial, with a thick root; stems strict, white and 

 shmmg, 3-4 dm. high; leaves 5-8 cm. long; sepals lanceolate, acuminate, 8-10 mm. 

 long; flowers diurnal; petals spatulate, 12-18 mm. long; petaloid stammodia 

 similar and almost as large; capsule 15 mm. long. 

 Jl, 



Sandy soil: s Utah. L. Son. 



5. N. pterosperma (Eastwood) Greene. Biennial; stem white, 1-3 dm. 

 high, divaricately branched; lower leaves spatulate, 2.5-3 cm. long, sinuately 

 dentate, with broad, usually obtuse teeth; petals oblanceolate, 1-1.5 cm. long; 

 petaloid staminodia similar; capsule about 1 cm. long. Sandy valleys: Colo. — 

 Utah. Son, Je-Jl. 



6. N. humilis (A. Gray) Rydb. Low branched perennial or biennial; stem 



2-4 dm. hierh. scahrnus-nubpnilpnf' IpnvnQ rkiTiTi':ififir? • nofola nKloT\/^i3r^laf« C_in 



mm. long, bright yellow; petaloid staminodia almost 

 long, rounded at the base. M. multiflora humilis A. 

 Colo.— N.M, Son. 



Dry soil : w Tex. 



7. N. Integra (M. E. Jones) Rydb. Rather simple biennial; stem pubem- 

 lent, 2-3 dm. high; lower leaves 4-5 cm. long; sepals lanceolate, 7-8 mm. long; 

 petals oblanceolate, 15-18 mm. long; staminodia similar, sUghtly smaller; cap- 

 sule 12-15 mm. long, acute at the base. M, multiflora integra M. E. Jones. 

 Sandy or clayey soil: Utah. Son. My-S. 



8. N. pumila (Nutt.) Greene. Low biennial; stem scabrous-puberulent, 

 2-3 dm. high; leaves oblanceolate, 4-8 cm. long, sinuately pinnatifid; petals 

 oblanceolate, acute, 10-12 mm. long; staminodia similar, but somewhat smaller; 

 capsule fully 1 cm. long, acute at the base. M, pumila Nutt. Barren hiUs and 

 sandy flats: Wyo. — Colo. — Utah. SubmonL Je. 



9. N. densa Greene. Li 



us white, nubenilent. 2-4 



and 



long, deeply pinnatifid; sepals lanceolate, acuminate, nearly 1 cm. long; petals 

 about 15 mm. long; staminodia similar, scarcely smaller; capsule about 15 mm. 

 long. Hillsides, canons, and dry table-lands: Colo. — Utah — N.M. Son, — MonL 

 Je-Au. 



10. N. laciniata (Rydb.) Woot. & Standi, Biennial or short-lived peren- 

 nial; stems 3-4 dm. high, white, puberulent; leaves 5-10 cm. long; petals 15-20 

 mm. long, short-clawed, oblanceolate; staminodia similar; capsule 15-18 mm, 

 long. Touteria laciniata Rydb. Hillsides: Colo. SubmonL Je-Jl. 



11, N. speciosa (Osterhout) Greene. Stout perennial; stem whitish, puberu- 

 lent, corymbosely branched, 3-8 dm. high; leaves linear or oblong-lanceolate, 10- 



