2(1). Leaflets narrowly elliptic, 5-15 mm. wide; flowers 8-13 mm. long, racemose 



in the axils of small 1-foliolate bracts; siliques 3-9 mm. wide 



2. C. serrulata. 



2. Leaflets linear, 2 mm. wide or less; flowers 4-7 mm. long, singly in axils of 

 3-foliolate cauline leaves; siliques 2-4 mm. wide....3. C. multicaulis. 



1. Cleome lutea Hook. Yellow bee-plant. 



Glaucous glabrous to sparsely pilose annual with erect to branching stems 5-15 

 dm. tall; leaves glabrous, usually 3- to 7-foliolate, slender-petioled or the upper 

 subsessile; leaflets oblong to oblong-oblanceolate, entire, sessile or subsessile, 1.5-5 

 cm. long; racemes much-elongate in fruit; pedicels slender, 1-2 cm. long; calyx 

 deeply 4-parted; petals yellow, obovate to oblanceolate, 6-8 mm. long; pod linear, 

 nearly terete, 3-7 cm. long; fruiting stipe slender, longer than the pedicel; seeds 

 pustulose. 



In wet gravel, mostly along streams and in bottom lands in N. M. and Ariz, 

 (rather widespread), May-Sept.; Neb. to Wash., s. to N. M., Ariz, and Calif. 



2. Cleome serrulata Pursh. Rocky Mountain bee-plant. 



Erect somewhat shrubby branched annual, 2-15 dm. tall, glabrous, glaucous, 

 unarmed; leaflets 3, narrowly elliptic, 2-6 cm. long, 5-15 mm. wide, pointed at 

 both ends; flowers in dense elongated many-flowered racemes; bracts narrow, sim- 

 ple; sepals united for one half to two thirds their length, persistent in fruit; petals 

 bright-pink to purplish, rarely white (f. albiflora Cockll.), 8-12 mm. long; disk 

 with nectariferous adaxial scale to 4 mm. long; stamens 13-20 mm. long; capsules 

 variable, linear-cylindric to fusiform, pointed sharply at both ends, 2-8 cm. long, 

 3-9 mm. wide, deflexed; gynophore 11-23 mm. long; pedicel 14-20 mm. long; 

 seeds several to many, ovoid, sharply pointed, 3-4 mm. long, black-brownish- 

 mottled, blistered, the cleft fused. Peritoma serrulatum (Pursh) DC, P. integri folia 

 Nutt. 



In seepage of springs and on edge of streams, in woods and along railroads and 

 roadsides, in s.-cen. Okla. (Johnston Co.) and n.e. corner of Tex. Panhandle, wide- 

 spread in N. M. and Ariz., May-Sept.; widespread throughout the Rocky Mts., 

 Great Basin and Great Plains, from n.w. Calif, to s.w. Can., Ariz., N.M., n. Tex., 

 s.-cen. Okla., Neb. and Minn.; adv. eastw. 



3. Cleome multicaulis DC. 



Slender erect unbranched or sparingly branched glabrous annual, 2-7 dm. tall; 

 leaflets 3, linear, strongly folded, 1-3 cm. long, 1-3 mm. wide; flowers in axils 

 of cauline leaves, in very open elongate racemes; petals pinkish-purple, 4-7 mm. 

 long; disk small, bulbous; capsule obovoid to linear, 9-18 mm. long, 2-4 mm. 

 thick, deflexed; gynophore 3-10 mm. long, the pedicel 15-22 mm. long, both deli- 

 cate; seeds subglobose, light-brown, 1.8-2.5 mm. long, smooth. C. sonorae Gray, 

 Peritoma sonorae (Gray) Rydb. 



In alkaline sinks, cienegas and old saline lake beds in Larrea belt in w. Tex. 

 (Presidio Co.) to N. M. and Ariz.; from s. Colo, to s.e. Ariz., s.w. N.M. to s.-cen. 

 Mex. (D.F.), very sporadic and rare; June-Aug. 



2. Cleomella DC. 



Erect slender to robust glabrous (rarely pubescent) annuals (ours) or perennial 

 herbs; leaves alternate, palmately 3-foliolate; leaflets entire, mucronate, less than 

 4 cm. long; stipules minute, filiform; racemes terminal, bracteate; sepals minute, 

 barely fused at base, tardily deciduous; corolla yellow, closed in bud, the petals 

 subsessile; stamens 6, equal; anthers tightly coiled when dry; capsule an obdeltoid 

 or rhomboidal silicle, often wider than long, the 2 valves deciduous, expanded 

 contrary to the placenta into 2 obtuse to sharply pointed cones; gynophore elon- 

 gate; style slender, persistent, indurate; seeds 3 to 20. 



988 



