12 The only species is S. alpina N, E, i^r, 39a Ectotropis. 



Cgpsules not thin and provided with expanding-keels to 

 their valves, v:hicl- expand when wetted; stamens niimer- 

 ous in many series. 4 



4. Stamens erect and evident. 5 



Stamens concealed under a mass of inflexed petals and 

 staminodes; a shrub; leaves with the acute edges end 

 keel finely lacerate-toothed; flower 2 inches in diam- 

 eter, purple; stigmas 10, very small; ovary 10-celled; 

 valves of the causule ascending-spreading when expand- 

 ed and not closing after once expanding, their expand- 

 ing-keel diverging and ending in"^ awn-like points; cells 

 roofed with rigid cell-wings, without a tubercle at the 

 0T>ening. 



The type of the genus is S. lacere, ^'^. 2. Br. (I'lesembryan- 

 themum lacerum. Haw.) 41a ^emnanthe. 



5. Stigmas and cells of the ovary and valves of the cacsule 



5; dwarf plants forming clumps about 3-3^ inches high; 

 leaves trigonous, tapering to an acute apex as viev/ed 

 from the face; with 1-2 small teeth on the keel at the 

 apex; stigmas plumose; ovary inferior; valves of the 

 capsule suberect or somewhat inflexed when wetted, with 

 diverging, expanding-keels ending in awn-like points; 

 cells roofed witb rather stiff cell-wings and the open- 

 ing nearly closed by a large, compressed tubercle. 



The type species is A. bellidiflorus, N. E. Br. (Ivlesem- 

 bryahthemum bellidiflortim, i-inn.) 34a Acrodon. 



Stigmas and cells of the ovary and valves of the capsule 

 8-10 6 



6. Leaves vrith several slender flexible teeth along the ed- 



ges and keel, velvety-nuberulous to the touch and dott- 

 ed; calyx-5-lobed; stigmas 9-10, subulate; ovary in- 

 ferior; valves of the caDsule reflexed v;hen expanded, 

 with parallel expanding-keels toothed on their edges 

 and ending in free membranous tips; cells roofed v;ith 

 stiff cell-'v^dngs and the opening roofed with stiff 

 cell-v;ings and the opening many nearly closed by a 

 large tubercle; seeds compressed-ovoi&, smooth. 



The only knovm species is 0. I^iiarlothii, N, E. Bp, 



40b Odontophorus. 



leaves quite entire and smooth at the edges and keel, 



glabrous, not dotted. 7 



7. Shrubby plant 1-2 feet high with very distinct internodes.8 



Plant 3-4 inches high; leaves stout, united for some dis- 

 tance at the basal part, somev.liat compressed, bluntly 

 keeled, not dotted; calyx 5-lobed; petals passing into 

 staminodes; filaments of the stamens bearded; stigmas 

 10; capsule very shallow; expanding-keels very broad 



