elliptic, plane or more or less evidently revolute, to 4 cm. long and 2 cm. wide, 

 apex usually acute, base cuneate, upper and lower surfaces consimilar in coloration 

 and indument: inflorescence consisting of usually numerous scorpioid cymes; cymes 

 solitary or geminate, densely flowered, borne terminal or extra-axillary along the 

 leafy stems. 3-10 cm. long, on naked peduncles 1-3 cm. long; calyx at anthesis 

 1-1.2 mm. long, the lobes unequal (especially in width), linear to broadly lanceo- 

 late, as long as or slightly longer than the corolla tube, at maturity nearly doubling 

 in size and becoming more unequal; corolla white, 1.5-3 mm. long, the tube sparsely 

 strigose outside, the limb 2-3 mm. broad; fruit 1-2 mm. thick, 1-2 mm. high. 



A weedy species, usually growing in marshes or damp situations or on land 

 subject to flooding, in Tex., n. to Jefferson. Hays. Bexar and Brewster cos., and 

 s.e. Okla. (McCurtain Co.), Apr.-Nov.; in Fla.. La. and Tex. and Okla., mostly 

 on the Coastal Plain, widely distributed in the W.I.. C.A. and trop. S.A. 



6. Heliotropium indicum L. Turnsole, alacrancillo. Fig. 651. 



Coarse, annual herb, villous to hispid or hispidulous. to 1 m. tall; stems loosely 

 branched, leafy, frequently fistulose; leaves with a petiole 4-10 cm. long, ovate 

 to elliptic, drying thin, to 15 cm. long and 1 dm. wide, the margin repand or undu- 

 late, apex acute, base obliquely acute to obtuse or subcordate; inflorescence a 

 simple very elongating scorpioid cyme to 3 dm. long, bearing two ranks of crowded 

 flowers and fruits; calyx broadly sessile, 1.5-2 mm. long, the lobes linear or linear- 

 lanceolate, unequal; corolla blue or violet (or rarely white), puberulent or strigose 

 outside, the limb to 4.5 mm. in diameter, the tube elongate, evidently surpassing 

 the calyx, usually about 3 mm. long, constricted at the throat; fruit miter-shaped, 

 glabrous or puberulent. 



Along river banks and bottoms, ditches, lake shores, swamps and along creeks, 

 e. half of Tex. w. to Dallas, Bexar and Hidalgo cos. and e. Okla. (LeFlore, Hughes, 

 McCurtain cos.), June-Oct.; widely distributed in the warmer parts of Am. from 

 n. Arg. to s. U.S.; also in the trop. of the Old World; probably a nat. of Am. 



2. Hackelia Opiz Stickseed 



Coarse biennial or perennial or rarely annual herbs; leaves alternate, broad and 

 veiny; flowers in naked or inconspicuously bracted racemes paniculately disposed; 

 pedicels slender, recurving in fruit; calyx cut to the base into spreading ovate to 

 oblong or lanceolate lobes; corolla white or blue, with a short or elongate tube; 

 lobes rounded, imbricate, throat with trapeziform intruded appendages; stamens 

 included, affixed at middle of tube; filaments slender, short; anthers oblong to ellip- 

 tic; style slender, scarcely if at all surpassing the mericarps; stigma capitate; ovules 

 4; mericarps 4, erect, ovoid, affixed ventrally to the pyramidal gynobase by a 

 broad medial or submedial areola, margin with subulate glochidiate appendages 

 that are frequently confluent at the base, back smooth or with glochidiate append- 

 ages. 



A genus centering in western North America with outlying species in South 

 America and Eurasia. 



1. Mericarps subequally prickly over the whole back or face 1. H. virginiana. 



1. Mericarps only marginally prickly 2. H. floribunda. 



1. Hackelia virginiana (L.) I.M. Johnst. 



Plant to about 1 m. tall, hirsute throughout, the stem freely branched above; 

 radical leaves broadly ovate to cordate, narrowed to a slender petiole, to 2 dm. 

 long; cauline leaves ovate-oblong to oblong-lanceolate, acuminate at apex, taper- 

 ing to the sessile base, to 15 cm. long, progressively reduced above and passing 

 into the bracts; the numerous loosely paniculate racemes divaricate, with small 

 bracts; pedicels and flower each about 2 mm. long, frequently supra-axillary; 



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