Plante Lindheimeriane. 153 
PORTULACACEZ: (by Dr. Engelmann). 
(579.) Tavinum aurantiacum (n. sp.): radice tuberosa; / 
caule adscendente herbaceo ramoso patulo -piteso ; foliis / 
lanceolatis s. lineari-lanceolatis subsessilibus carnosis; flori- 
bus axillaribus singulis; pedunculis supra basin articulatis 
bibracteolatis, fructiferis reflexis; sepalis ovatis acuminatis 
tricarinatis, fructiferis subpersistentibus; petalis ovatis mu- 
cronatis; staminibus sub-25; seminibus lineis gyratis carina- 
tis et striis tenuissimis transversis eleganter notatis. — On the 
Sabinas, and more abundantly on the Liano, rare about New 
Braunfels, on rocky soil or almost naked rocks; in flower 
principally in July and August, but also at other seasons, 
always after heavy rains. — Root white, fleshy, tuberous, 
often bifurcated. Stems 8-16 inches long, ascending, much 
branched. Leaves 11-2 or even 3 inches long, 2—4 lines 
wide. Peduncle 4—5 lines long. Sepals of the same length ; 
petals 5 lines long and 3 wide, orange to red; filaments 
red; style and stigma orange. Seeds elegantly marked, 
black, larger than in any other North American species. — 
Distinct from all other species described by De Candolle, by 
the single flowers. 
(580.) Tatinum sarMENTOsuM (n. sp.) : radice crassa ; caule 
prostrato; ramis debilibus sarmentosis ascendentibus foliosis ; 
foliis carnosis late ovatis cuspidatis basi attenuatis subsessili- 
bus ; cymis axillaribus bracteatis subtrifloris (rarius compositis) 
versus apicem laxe paniculatis; floribus longe pedicellatis ; 
sepalis ovatis cuspidatis membranaceis deciduis; staminibus 
sub-15; seminibus nigris nitentibus sub lente tenuiter tuber- 
culatis. — New Braunfels, among shrubs on the banks of the 
Guadaloupe. July, September. — Stems prostrate ; branches 
weak, ascending, supported by the shrubs under “ which the 
plant grows, often 6 —10 feet long ;’”’ —the specimens before 
me are 2—4 feet long. Lower leaves 2}—3! inches long, 
1-1; wide. Pedicels 6—12 and more lines long, thickened 
at the apex. Sepals about one line long; flowers apparently 
ae 
