182 FLORA OF TEXAS. 



woods. Stems 1° high. Floivers purple, 2' wide, on pedun- 

 cles which are sometimes 1° long. 



MALVASTRUM, Gray. 



Involucel 1-3-leaved or none. Styles 5-20. Stigmas 

 capitate. Carpels beaked or beakless, 1-seeded. Seed as- 

 cending. Embryo curved or annular. Radicle inferior. 

 Herbs or shrubby plants, rough with rigid hairs. Floioers 

 yellow. * 



M. ANGUSTUii, Gray. Annual; stem erect, branching; 

 leaves lanceolate, sparingly serrate, short-petioled ; stijmlcs 

 bristle-like; floivers axillary, mostly solitary; involucel seta- 

 ceous, 2-3-leaved; carpels 5, circular, awnless, at length 

 2-valved. Stem 6-12' high. Calyx enlarged in fruit. 



SID A, L. 



Involucel none. Calyx angular. Styles 5-15. Stigmas 

 capitate. Ovaries 1-celled. Carpels erect, mostly 2-valved 

 and 2-beaked at the apex, separating at maturity from each 

 other, and from the central axis. Seed resupinate, sus- 

 pended, 3 -angled. Embryo curved. Radicle superior. 

 Branching herbs or shrubs, with chiefly undivided leaves, 

 and small yellow or reddish flowers in their axils. 



* Leaves, at least the lower ones, cordate. Carpels 5. 



S. SPINOSA, L. Annual; minutely pubescent; JmwcAes 

 erect; leaves oblong-ovate, acute, serrate, the slender 

 petioles often with a tubercular spine at the base, the 

 lower ones cordate; stipules setaceous, half as long as 

 the petioles; floivers single or clustered, on short, erect 

 peduncles; carptels faintly reticulated, each pointed with 

 two erect subulate spines. Stems l°-2° high. Floiuers ^' 

 wide, yellow. 



♦ * Leaves not cordate. 



