so FiKLD Manual 



■!.■{. Robinia 1.. T.ocust. 



Trees or shrubs with alternate odd-pinnate non-punctate 

 leaves and with stijjular spines. 



Flowers shovv}% in racemes; fruit a Bat bean. 

 1. Twigs. i)etioles and pods glabrous or nearly so; Howers 



white. A", f^scudoacacia. 

 1. Twigs and petioles glandular; pods hispid; flowers 

 pinkish. A'. I'isLOsa. 



1. Robinia pseudoacacia L. Common Locust. A 

 large slender tree with \ery rcugh bark, of ra])id growth. 

 Wood very hea\>-. hard, strong, tough, valuable, and very 

 durable in contact with the ground; used for posts, railroad 

 ties, wagon hubs, furniture, and in ship building. All parts 

 of the plant very poisonous, Tt is troublesome from sprout- 

 ing from the rr.ots. Penn. and Ohio to Ga.. Iowa, Kan., and 

 Okla. 



2. Robinia viscosa \'ent. Clammy Locust. A small 

 tree with rough bark, l^nderground parts somewhat poison- 

 ous. Wood brown, the sap-wood yellow. \^a. to (la. Also 

 escaped in Middle and Eastern States. 



( )rder, Celastkalks. 



Rhaiiniaccac. Buckthorn l-'amily. 



■{|. Rhamnus ('Tourn.) L. Buckthorn. 



Shru.l)s or small trees with alternate, rarely opposite, sim- 

 ple serrate (.r minutely serrulate leaves, and with berry-like 

 drupes containing I'-l stones. 



Flowers bisporangiate or diecious or imperfectly mono- 

 sporangiate, small, in small axillary clusters. Twigs sor.e- 

 times ending in stout thorns. 



1. Leaves acute, with <i-l<> pairs of lateral veins: nutlets 

 smooth; umbels peduncled ; flowers bisporan-^iate. R. 

 caroliniana. 



1. Leaves with 8 or 4 pairs of lateral veins, the basal pair 

 prominent; nutlets of the fruit grooved; flowers 

 diecious or imperfectly monosporangiate. R . rafharfira. 



