to oblong-elliptic with a broader cordate half-clasping base, some spatulate- 

 lanceolate with a dilated auriculate-clasping base, the largest leaves to about 

 22 cm. long and 6 cm. wide, rounded to acuminate at apex; inflorescence at length 

 loosely paniculate-racemose, with the later bracts very small or wanting and some- 

 what unilateral pedicels about the length of the calyx; flowers open throughout 

 the day; calyx lobes subulate-lanceolate but rather obtuse, shorter than or 

 equaling the campanulate tube, attaining the middle of the corolla tube, about 

 equaling the 4-valved capsule, somewhat callous-margined; corolla tubular- 

 campanulate. greenish-white or yellowish, 12-23 mm. long, somewhat pubescent, 

 a little constricted at the orifice, the tube slightly enlarging upward, the sinuately 

 5-lobed limb about 8 mm. in diameter; capsule ovoid, 8-1 1 mm. long ; seeds 

 brown, shining, pitted-reticulate. 



On breaks of arroyos and canyons, in wet or dry sandy-clay soils of river 

 beds and washes, in gravelly-sandy soils on slopes, at base of boulders and on 

 ledges of mesas and mts. in the Tex. Rio Grande Plains, South Plains and Trans- 

 Pecos, Okla. (Jackson Co.), N. M. (widespread) and Ariz, (almost throughout 

 state), Mar.-Nov.; from Tex., w. to Calif, and n. Mex. 



4. Nicotiana plumbaginifolia Viv. 



Annual to about 1 m. high, the erect stem slender and tuberculate-hispid, with 

 long basal branches; basal rosulate leaves few, spatulate to obovate-spatulate or 

 oblanceolate, hispid, to about 25 cm. long; cauline leaves progressively smaller 

 and becoming lanceolate or linear-lanceolate to the widely branched inflorescence, 

 sessile or clasping and auriculate at base, abruptly acuminate and somewhat 

 twisted at apex, usually strongly undulate-plicate; flowers few, vespertine; calyx 

 tubular, 8-13 mm. long, the long narrow segments subulate-filiform and about 

 equal to the tube; corolla puberulent on outer surface, the slender tube 25-35 

 mm. long, greenish-white and lavender or purplish-tinged, the limb about 1 cm. 

 wide and with ovate acute lobes; capsule narrowly ovoid, 8-11 mm. long; seeds 

 light-brown with wavy-reticulate surface. 



In resacas on edge of water in the Brownsville region in s. Tex., Jan.-Apr.; 

 from Tex. through Mex., W.I. and C. A. to S. A. 



3. Petunia Juss. 



About 40 species, mostly in South America. 

 1. Petunia parviflora Juss. Wild petunia, seaside petunia. Fig. 681. 



Annual; stems leafy, prostrate and rooting at the nodes, diffusely branched 

 to form mats to 3 dm. wide or more, glandular-puberulent; leaves linear-oblong 

 to spatulate, fleshy, about 1 cm. long; flowers solitary, lateral, on very short 

 peduncles; calyx 5-parted to below middle; sepals in fruit to 1 1 mm. long and 

 1.5 mm. wide, linear-oblanceolate to linear-spatulate, obtuse; corolla funnel- 

 form, purple or reddish-violet, with yellow or whitish tube and 5 minute unequal 

 retuse lobules that are plicate in bud, the tube about 6 mm. long; stamens inserted 

 low in corolla; filaments 3 short and 2 longer; capsules 3-4 mm. long, ovoid- 

 ellipsoid, acute, 1 -celled, bivalved, the valves leathery-chartaceous; seeds numer- 

 ous, angular and more or less raised-reticulate. 



In moist or wet soil in beds of streams, about lakes, in water and shallow 

 streams, along beaches and on muddy flats in most of Tex., N. M. (Sierra, 

 Bernalillo and Dona Ana cos.) and Ariz. (Navajo to Mohave, s. to Graham, Pima 

 and Yuma cos.), Apr .-Sept.; from s. Fla. to Calif., n. to Va., s. to trop. Am. 



Our plant is a "poor" relative of the showy cultivated petunias that are derived 

 from P. axillaris (Lam.) B.S.P. and P. violacea Lindl. of South America. 



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