602 ONAGRACEAE 



9. S. minus A. Nels. A small annual; stems simple or with a few branches 

 at the base, 3-10 cm. high, puberulent; leaves 1-2.5 cm. long, mostly short- 

 petioled; tube of the hypanthium 1.5-2 mm. long; petals 1-1.5 mm. long; cap- 

 sule nearly straight or somewhat contorted, 2 cm. long, 1 mm. thick. S. Nelsonii 

 Heller. Dry hills: Wyo. My. 



10. S. tortum (Lev.) A. Nels. Annual; stems branched near the base, 

 1-3 dm. high, more or less strigose; leaves petioled; blades oblanceolate or linear- 

 oblong, strigose or nearly glabrous, 2-4 cm. long; tube of hypanthium 1-2 mm. 

 long; petals ochroleucous, 1-2 mm. long; capsule 2 cm. long, variously twisted. 

 S. minutiflora (S. Wats.) Rydb. Sandy soil and dry hills: Wyo. Colo. Utah 

 Ore. My-Je. 



11. S. chamaenerioides (A. Gray) Small. Annual; stem slender, 1-4 dm. 

 high, somewhat viscid-puberulent above; lower leaves petioled, the uppermost 

 sessile; blades lanceolate or oblanceolate, repand-denticulate or entire, 3-6 cm. 

 long; tube of the hypanthium 2 mm. long; petals yellow, 1.5-2 mm. long; cap- 

 sule linear-cylindric, 3-5 cm. long, 1 mm. thick, straight or slightly curved. Dry 

 places: Tex. s Utah Ariz. Son. Mr-My. 



12. S. alyssoides (H. & A.) Walp. Annual; stem branched, 1-3 dm. high, 

 more or less strigose; leaves petioled; blades oblanceolate or elliptic, 2-6 cm. 

 long, more or less strigose; tube of hypanthium 5-7 mm. long, strigose; petals 

 white or ochroleucous, 5-6 mm. long; capsule linear-cylindric, 2-2.5 cm. long, 

 1 mm. thick, more or less twisted. S. implexa A. Nels. Sandy places and hills: 

 Ida. Utah Calif. Ore. Son. My-Je. 



13. S. macrophylla (Small) Rydb. Annual; stem 1-3 dm. high, sparingly 

 villous, branched; leaves petioled; blades obovate or broadly spatulate, 3-5 cm. 

 long, more or less villous; tube of the hypanthium 5-6 mm. long, villous; petals 

 white, 7-8 mm. long, broadly obovate. Saline or alkaline soil: Utah Nev. 

 Son. 



14. S. utahense Small. Annual; stem erect, 2-10 cm. high, simple or with 

 ascending branches, sparingly villous; leaves short-petioled; blades spatulate or 

 obovate or oval, 1-2.5 cm. long, densely villous, entire or nearly so; calyx-tube 

 7-9 mm. long; petals obovate, 3-5 mm. long; capsule filiform, 1.5 cm. long, spir- 

 ally twisted at the base. Sandy soil: Utah. Son. My-Je. 



19. CHYLISMIA Nutt. 



Caulescent annual herbs. Leaves pinnatifid, but sometimes reduced to the 

 terminal segment. Flowers in terminal racemes, except in one species. Hy- 

 panthium produced beyond the ovary into an obconic or funnelform tube. 

 Sepals 4, reflexed. Petals 4, entire, yellow or ochroleucous, sometimes turning 

 purplish. Stamens 8; anthers oblong, attached to the middle. Stigma capitate, 

 entire. Capsule linear or clavate, membranous, peduncled. Seeds in a single 

 row in each cell. 



Flowers axillary; delicate plant 1 dm. high or less. 1. C. pterosperma. 



Flowers in terminal racemes or panicles. 



Leaf-blades simple, sinuate or entire, or pinnate with the lower leaflets much reduced. 

 Plant glabrous, puberulent, minutely strigose, or glandular. 



Petals 3-5 mm. long; leaves glabrous. 2. C. scapoidea. 



Petals 7-10 mm. long; leaves grayish-strigose when young. 3. C. cruciformis. 

 Plant more or less hirsute or villous, with long white hairs. 



Leaves simple or with a few (1 or 2 pairs, rarely more) small lobes on the 



petioles; leaves and stem sparingly hairy. 



Petals 10-12 mm. long; pod linear, 5-6 cm. long. 4. C. brevipes. 



Petals 2-7 mm. long; pod clavate, less than 1.5 cm. long. 



Petals 6-7 mm. long. 5. C. Parryi. 



Petals 2-5 mm. long. 



Petals 4-5 mm. long; stem tall, 3 dm. high or more, branched. 



6. C. tenuissirna. 

 Petals 2-3 mm. long; stem low, about 1 dm. high, simple. 



7. C. Walkeri. 

 Leaves interruptedly pinnate, with several leaflets. 



Petals 8-10 mm. long; leaves and lower part of the stem densely hairy. 



8. C. venosa. 



