to exceeding the leaves, to 11.5 cm. long; involucre of 2 conspicuous ovate to sub- 

 orbicular scarious bracts; rays 2 to 5, to 4 mm. long; flowers white or rose-tinged, 

 the calyx teeth obsolete, the stylopodium obsolete; carpophore entire; fruit ellip- 

 soid, 3-4 mm. long, 3-5 mm. broad (broader than long), constricted at the com- 

 missure and flattened laterally, glabrous, the filiform primary ribs prominent, the 

 secondary ribs and reticulations evident, the seed face plane; an oil-bearing layer 

 beneath the epidermis, occasionally containing small oil tubes and a thick layer of 

 strengthening cells surrounding the seed cavity. C erecta (L. f.) Fern. 



Edges of streams and other wet places in e. half of Tex., May-Sept.; from Del., 

 s. to Fla. and w. to Tex.; also W.I. and Mex. to C.A., S.A. and e. Asia. 



3. Spermolepis Raf. Scale-seed 



A genus of 5 species, three in the southeastern and central United States and 

 adjacent Mexico, one in southern South America, and the fifth in the Hawaiian 

 Islands. 



1. Spermolepis divaricata (Walt.) Raf. Fig. 576. 



Slender annual from taproot, erect, 1-7 dm. high; leaves oblong to oblong-ovate, 

 to 5 cm. long and 35 mm. wide, ternately or ternate-pinnately decompound; ulti- 

 mate divisions of leaves linear, acute; inflorescence of compound umbels, the ter- 

 minal and axillary peduncles exceeding the leaves; peduncles 1-5 cm. long; involu- 

 cre lacking; involucel of a few linear acute bractlets with the margins scarious and 

 usually callous-toothed; rays 3 to 7, divaricate, subequal, 5-35 mm. long; pedicels 

 1 to 6, to 3 cm. long or the central flower of each umbellet sessile; flowers white, 

 the calyx teeth obsolete; the stylopodium low-conic; carpophore 2-cleft at the apex; 

 fruit ovoid, compressed laterally, 1.5-2 mm. long, about 1.5 mm. broad, tubercu- 

 late, the filiform ribs rounded; oil tubes 1 to 3 in the intervals and 2 on the com- 

 missure, the seed face sulcate. 



In swamps and moist woodlands in the Timber Belt and Blackland Prairies of 

 Tex., Apr.-June; from Va., s. to Fla., w. to Kan. and Tex. 



4. Tauschia Schlecht. 



A genus of about 20 species of the highlands of Mexico and northern South 

 America and western United States. 



1. Tauschia texana Gray. Fig. 577. 



Acaulescent perennial from a taproot, 1-4 dm. high, glabrous throughout; leaves 

 oblong, to 15 cm. long and 4 cm. wide, pinnate; leaflets sessile to petiolulate, 

 ovate, distinct, the larger ones pinnately parted or lobed, the divisions cuneate; 

 inflorescence of compound umbels; peduncles 1-4 dm. long; involucre lacking or 

 of a single foliaceous bract; involucel of several linear to lanceolate connate bract- 

 lets, shorter than the flowers; fertile rays 5 to 8, unequal, 5-25 mm. long; flowers 

 yellow, with pedicels 1-2 mm. long; calyx teeth minute; fruit oval, 3-4 mm. long, 

 2-3 mm. broad, slightly compressed laterally, glabrous, the ribs filiform; oil tubes 

 3 or 4 in the intervals and 4 on the commissure; seed face deeply sulcate. Miise- 

 niopsis texana (Gray) Coult. & Rose. 



In alluvial thickets and wet woods in s. part of Blackland Prairies and in coastal 

 region in Tex., Feb.-June; endemic. 



5. Ammoselinum T. & G. Sand-parsley 



A genus of 4 species of the south-central and southwestern United States and 

 adjacent Mexico; one species in southern South America. 



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