48 PROCEEDINGS OF THE AMERICAN ACADEMY 



Prosopis (?) heterophylla, Benth. Without flowers or fruit, 

 but the peculiar foliage leaves the species unmistakable. A slender 

 tree 10 to 15 feet high, with two or three drooping branches and 

 thinly laminated bark, which cleaves off in large pieces. Guaymas. 

 (628.) 



Prosopis (Algarobia) articulata. An upright shrub 8 to 12 

 feet high, somewhat finely pubescent, armed with straight stipular 

 spines |- inch long or less : pinnae a single pair on a rhachis 2 or 3 

 lines long; leaflets 6 to 15 pairs, narrowly oblong, somewhat reticu- 

 lated, H to 3 lines long: flowers greenish yellow, pedicellate in loose 

 short-pedunculate spikes an inch or two long : petals distinct, villous 

 at the apex, nearly 1^ lines long: anthers glanduliferous : ovary 

 stipitate, pubescent ; pod glabrous, thin-coriaceous, compressed, moni- 

 liform, 5-12-jointed, the joints about 2^ lines broad. — On stony 

 mesas and foot-hills about Guaymas. (197.) 



Prosopis (Algarobia) Palmeri. A loosely branching shrub 4 

 feet high, finely pubescent, armed with straight stipular spines an inch 

 long or less : pinnae a single pair on a very short rhachis ; leaflets 3 

 to 6 pairs, oblong-elliptic, 2 lines long or less : flowers minutely silky, 

 sessile in a loose short-pedunculate spike an inch long; corolla tabular 

 and somewhat angled, deeply 5-toothed, not villous within, 2 lines 

 long: style and filaments twice longer, yellow, the anthers bearing a 

 large deciduous gland : ovary tomentose, stipitate, straight, many- 

 ovuled. — Without fruit, but there can be little doubt as to the genus, 

 though the petals are connate to near the top and without viHosit}'. 

 The flowers are said to be of a bright golden yellow and very 

 fragrant. Muleje. (2.) 



Desjianthus virgatus, Benth. Shrubby, about 4 feet high. 

 Guaymas. (86.) 



Desmanthus Jamesii, Torr. & Gray, var. Glabrous; the pods 

 3 to nearly 5 inches long; said to be a shrub. Common at Guaymas. 

 (641, 642.) 



Mimosa laxiflora, Benth. A shrub 5 to 8 feet high ; flowers 

 rose-color turning to white. About Guaymas. (149, 169.) 



Acacia Wrightii, Benth. A compact shrub 5 or 6 feet high, 

 armed with stout recurved spines. This is occasionally the case in 

 more eastern specimens, though usually they are wholly unarmed. In 

 a deep canon, Los Angeles Bay. (534.) 



Acacia flexicaulis, Benth. A rigid shrub, 5 feet high. Deep 

 canons at Los Angeles Bay. (548.) 



Acacia filicina, Willd. Guaymas, in mountain ravines. (25 1. ) 



