Part 1, 1905] CRASSULACEAE 35 



at the base ; basal leaves acuminate ; I^ower 

 Californian. 52. D. acuminata. 



I^eaves of flowering branches not strongly sagit- 

 tate ; basal leaves acute : central Californian. 53. D. Lingula. 

 Leaves glaucous. 



Corolla-lobes obtuse. 54-. D. septentrionalis. 



Corolla-lobes acute. 



Inflorescence paniculate. 



Inflorescence elongated, many-flowered. ^^. D. paniculaia. 



Inflorescence sbort, few-flowered. 56. D. humilis. 



Inflorescence cymose. 



lycaves Ungulate. 57. D. caespitosa. 



Leaves linear-lanceolate. 



Inflorescence compact ; brandies short. 58. D. Helleri. 

 Inflorescence open : branches elongated. 59. D. Cotyledon. 

 Jtl^eaves narrow, nearly linear. 60. D. elongata. 



1. Dudleya Rusbyi (Greene) Britton & Rose, Bull. N. Y. ^ 



Bot. Gard. 3 : 13. 1903. '- < f^^ 



Cotyledon Rusbyi Greene, Bull. Torrey Club 10 : 125. 1883. 



Probably perennial, acaulescent. Leaves in dense rosettes, rhomboid-ovate, 1.5-2 cm. 

 long, acuminate, glabrous but papillose-roughened ; flowering branches erect, 7-12 cm. 

 high, glabrous ; leaves of flowering stems linear, scattered and small ; inflorescence a two- 

 branched few-flowered cyme; pedicels 2-6 mm . long; calyx-lobes somewhat unequal, ovate, 

 obtuse or acute; corolla deep-red or "coral-red," 10mm. long, the acuminate lobes united 

 into a tube longer than the calyx. A very rare and interesting species, perhaps not prop- 

 erly referable to this genus. 



Type locality : Near Prescott, Arizona. 

 Distribution : Arizona. 



2. Dudleya albiflora Rose, Bull. N. Y. Bot. Gard. 3: 13. 1903. 



Perennial by a multicipital caudex 2-3 dm. in diameter and with 25 rosettes or more 

 crowning the short stems. Leaves narrow, 1-1.5 cm. broad, strap-shaped to lanceolate, 

 4-5 cm. long, becoming purplish, not glaucous, thick and fleshy but distinctly flattened, 

 acute ; corolla white. 



Type locality : Magdalena Bay, I^ower California, 

 Distribution : Known only from the type locality. 



3. Dudleya pulverulenta (Nutt.) Britton & Rose, Bull. N. Y. 



Bot. Gard. 3: 13. 1903. 



Echeveria pulverulenta Nutt,; T. & G. Fl. N. Am. 1 : 560. 1840. 

 Echeveria argentea I^emaire, 111. Hortic. 10 : Misc. 78. 1863. 



Rootstock short, thick ; plant mealy- pulverulent all over. Flowering stems stout, 8 

 dm. high or less; basal leaves numerous, spreading, flaccid, 1.5 dm. long or less, 5-9 cm. 

 wide, broadly spatulate to obo vat e- spat ulate, acute to acuminate ; leaves of the flowering 

 stems numerous, broadly ovate, deeply cordate-clasping, acute, or the lower ones ovate and 

 acuminate ; inflorescence of two or several ascending racemes 1-3 dm. long ; pedicels very 

 slender, 8-18 mm. long, nearly horizontal, the flowers erect or ascending; flowers about 1.5 

 cm. long ; calyx-segments lanceolate to ovate-lanceolate, about 5 mm. long, acute ; corolla 

 red, its lobes acute, united to about the middle ; carpels narrow, distinct or nearly so, erect. 



Type locality : San Diego, California. 

 Distribution : Southern California. 



4. Dudleya Anthonyi Rose, Bull. N. Y. Bot. Gard. 3 : 13. 1903. 



Resembling D. pulverulenta^ but basal leaves more elongated, 2 dm. long by 4-5 cm. 

 broad ; stem-leaves seemingly narrower ; pedicels slender and longer, and calyx-lobes 

 narrower. 



Type locality : San Martin Island, Lower California. 

 Distribution : Known only from the type locality. 



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