STANDLEY TREES AND SHRUBS OF MEXICO. 761 



Slender tree, 6 to 9 meters high ; leaves broadly cordate to orbicular-cordate, 

 4 to 10 cm. long, acute or acuminate, green above; petals white, 8 mm. long; 

 carpels about 12, 8 to 10 mm. long. 



3. Robinson ella cordata Rose & Baker, Gard. & For. 10: 244. f. 31. 1897. 



Durango to Puebla and Oaxaca ; type from Tamazylapan, Oaxaca. 



Tree, 4.5 to 9 meters high ; leaves ovate-cordate, 4 to 13 cm. long, long- 

 acuminate, crenate-dentate, glabrate above ; petals white or purplish, 1.5 to 2.5 

 cm. long. " GuS,cima " (Durango). 



10. SIDA L. Sp. PI. 683. 1753. 



Herbs or shrubs, with stellate-pubescence ; leaves entire or toothed ; flowers 

 sessile or pedicellate, axillary, racemose, or paniculate, the pedicels often 

 jointed ; bractlets none ; carpels 5 or more, 1-seeded, bivalvate or indehiscent. 



Few of the species listed below are true shrubs, but it has appeared more sat- 

 isfactory to list all of them here as a matter of record and convenience. 



Flowers adnate to the petioles of leaflike bracts ; petioles hirsute ; flowers 

 congested at the ends of tlie branches ; carpels muricate. 

 Plants decumbent ; leaves oblong to oval ; petals 7 to 10 mm. long. 



1. S. ciliaris. 

 Plants erect ; leaves linear or oblong-linear ; petals 12 to 15 mm. long. 



2. S. anomala. 

 Flowers never adnate to the petioles of leaflike bracts ; petioles usually- not 

 hirsute ; flowers variously arranged ; carpels not muricate. 

 Calyx terete. 



Leaves entire, linear 3. S. linifolia. 



Leaves serrate or dentate. 



Leaves cuneate at base, narrowly lanceolate. 

 Leaves glabrous on the upper surface; inflorescence naked or nearly 



so 4. S. lodiegensis. 



Leaves densely stellate-pubescent on both surfaces; inflorescence 



densely leafy 5. S. stricta. 



Leaves all or mostly cordate at base, oblong to rounded-cordate. 

 Pedicels less than twice as long as the calyx in anthesis. 



6. S. pyramidata. 

 Pedicels mostly more than three times as long as the calyx in anthesis. 

 Flowers in open panicles. 



Leaves densely stellate-pilosulous, crenate 7. S. paniculata. 



Leaves green, sparsely and very minutely stellate-pubescent, lacini- 



ate-serrate 8. S. tehuacana. 



Flowers solitary in the leaf axils. 



Leaves pilose on the upper surface with mostly simple hairs ; upper 



leaves nearly sessile 9. S. filipes. 



Leaves minutely stellate-tomentose on the upper surface; upper 



leaves slender-petiolate 10. S. palmeri. 



Calyx conspicuously angulate. 

 Carpels 7 to 12. 

 Leaves, all or most of them, deeply cordate at base, ovate-cordate, 

 densely stellate-velutinous. 



Stems and calyx pilose with long, slender hairs 11. S. setifera. 



Stems and calyx finely stellate-tomentose 12. S. cordifolia. 



