52 PROCEEDINGS OP THE AMERICAN ACADEMY 



EcHiNOPEPON Palmeri. Annual ; stems glabrous : petioles not 

 pilose ; leaves thin, very minutely scabrous above, nearly glabrous 

 beneath, broadly cordate, 1 to 2 inches broad, 5-lobed to beyond the 

 middle with rounded sinuses, the subrhombic lobes acute and some- 

 vphat setosely apiculate, sparingly denticulate : male flowers in narrow 

 panicles mostly exceeding the leaves ; corolla o-lobed to below the 

 middle, 1| to 2 lines broad ; anthers sigmoid ; pistillate flowers soli- 

 tary in the same axils, on filiform peduncles 3 or 4 lines long ; ovary 

 very oblique, glabrous, the naked slender beak longer than the 

 echinate base : fruit without the beak about 2^ lines long, covered 

 with stout straight spines | line long, 1 -celled, 1-seeded : seed ascend- 

 ing, compre-sed, 2 lines long. — In the shade of overhanging rocks in 

 the mountains about Guaymas. (304.) This and the preceding 

 species, with E. Bigelovii, E. parvijiora^ and E, minima, form a well 

 marked group in Naudin's genus Ecldnofe'pon, which genus should in 

 my opinion be restored. 



Cereds Prixglei, Watson. " Cardon " ; forming a forest on the 

 summit of S. Pedro Martin Island. The dead wood is much used for 

 fuel and other purposes, and the seerly fruit is an article of food. It 

 attains an average heiglit of 25 feet (sometimes reaching 35 feet), 

 with a circumference below the branches of 6 or 7 feet. (418.) 



Opuntia ? Of the 0. prolifera group, but the specimens are 



without flowers or fruit. About 4 feet high, much branched and 

 very spiny, tbe joints of the specimens 1 to H inches long, with the 

 areohe of the tubercles terminated above by a dense tuft of spiny 

 bristles 2 lines long; spines 3 to 7, vaginate, the longer 9 to 12 lines 

 long. — " Choyer" ; common on S. Pedro Martin Island. (419.) 



Trianthema. monogyna, Linn. Glabrous and stems red : sepals 

 very shortly cuspidate : stamens 10 : crest of the capsule 2-parted. — 

 Common in some gardens at Guaymas. (155.) 



Trianthema monogyna, Linn., var. (?) Glabrous and green 

 throughout or pubescent : sepals long-cuspidate : stamens usually 5 : 

 concave crest of the capsule entire. — Apparently distinct from tlie 

 List, but the species as represented in the Gray herbarium is very 

 variable. Very common in gardens at Guaymas. (153, 156.) 



MoLLUGO vertic'illata, Linn. In the mountains about Guay- 

 mas. (255.) 



MoLLUGO Cerviana, Scr. Common in sand and on high gravelly 

 mesas, Guaymas. (184.) 



PORTLANDiA PTEROSPERMA. A shrub Or small tree, 2 to 10 feet 

 high : leaves thin, rhombic-ovate to oblong, acute or subacuminatt^, 



