SAXIFRAGACE. | 381 
Order XLVIII. SAXIFRAGACE. 
Saxifragee, Benth. et Hook. Gen. Plant. 1. p. 629. 
About seventy-five genera, embracing 550 species, are referred to this order. There 
are herbaceous, shrubby, and arboreous species; and they grow chiefly in the temperate 
and frigid regions of the northern hemisphere, less numerous in the south, and very 
few in the tropics. 
Tribe SAXIFRAGEA. 
This tribe is the most numerous in species; and they are all herbaceous plants. 
1. SAXTFRAGA. 
Saxifraga, Linn. Gen. Plant. n. 559; Benth. et Hook. Gen. Plant. i. p. 635. 
A genus of about 160 species, almost confined to the temperate and frigid regions of 
the northern hemisphere, where they are generally diffused. A few species occur in 
South America; but the genus is not represented either in South Africa, Australia, or 
the Pacific islands. 
1. Saxifraga, sp. 
Sourn Mexico, rocks at 7000 feet in the Cordillera of Oaxaca (Galeott?, 2836 ; Cthies- 
breght, 119). Hb. Paris. 
9. Saxifraga, sp. | 
Norta Mexico, San Luis (Virlet d Aoust, 1005). Hb. Paris. 
These plants bear manuscript names under this genus in the Paris Herbarium. 
2. HEUCHERA. 
Heuchera, Linn. Gen. Plant. n. 320; Benth. et Hook. Gen. Plant. i. p. 638. 
About twenty-four species, restricted to North America, ranging from Mexico nearly 
up to the arctic regions. 
1. Heuchera longipetala, Ser. (char. amplif.). 
Ferrugineo-pilosa, foliis cordato-orbicularibus obscurissime lobatis aristulato-dentatis, floribus parvis 
cymoso-paniculatis, scapis pedicellisque gracilibus, calyce albo-glanduloso-hirsuto anguste cam- 
panulato, lobis inzequalibus, petalis linearibus quam ealycis lobi duplo longioribus, staminibus 
exsertis. 
Herba perennis, scaposus, 9-18-pollicaris, ferrugineo-pilosa, pilis breviusculis. Folia longe (3-5- 
poll.) graciliterque petiolata ; lamina membranacea, cordato-orbicularis, 1-2 poll. diametro, 
obscurissime lobata, sepe subquinquenervis, aristulato-dentata, utrinque plus minusve appresse 
pilosa, supra demum glabrescens ; stipule parve, fimbriate. Flores ad 3 lineas longi, anguste 
cymoso-paniculati; scapus gracilis, infra medium 2—3-bracteatus, bracteis parvis ; calyx albo- 
