52 PORTULACACEA. 



3. CLAYTONTA, Linnsens. 



a. Annnala with fibrous roots, rarely with bulblets. 



Stems simple, bearing a single pair of united or distinct leaves. 



Xeaves united into a cup enclosing the raceme ►^^ ^ ^. . . 1 



Leaves united at the base on one or both sides 2, 3 



Leaves distinct (No. 4 with bulblets at base) 2, 3, 4, 5, 11, 13 



Stems usually branching, leafy. 



Leaves opposite stems often rooting at joints and bulbiferous '. 6 



Leaves alternate 7, 8, 9, 10 



6. Perennials, with deep-seated tubers, stem leaves, a pair or a whorl. . 11, 12, 13 



1. C. perfoliata, Donn. From 1 to 12 inches high: radical leaves broad. 

 Var. parviflora, Torr. Radical leaves all linear or spatulate. 



2. 0. spathulata, Dougl. Very slender: leaves distinct or united on one side. 



3. 0. exig^a, T. &. G. Glaucous: leaves nearly filiform; the .pair broader, united 

 at base. 



4^ C. bulbifera, Gr. Stems lax: long pedicels with conspicuous bracts. 



6. C. cordifolia, Watson. Pair of leaves ovate, acute; radical, cordate: no bracts. 



6. C. diamissonis, Esch. Leaves oblanceolate: petals white. 



7. C. parviflora, Mocino. Very slender: leaves broadly spatulate, small. 



8. C. dichotoma, Nutt. Small: leaves linear: petals unequal: stamens 3. 



9. 0. linearis, Dougl. Leaves slender, clasping: sepals broad, often colored: petals 

 white. 



10. 0. diflPusa, Nutt. Leaves ovate or deltoid, petioled: racemes often axillary. 



11. 0. Caroliniana, Michx., var. sessilifolia, Torr. Usually one radical leaf; th« 

 pair lanceolate to linear: a single scarious bract. 



12. C. triphylla, Watson. Leaves slender: raceme compound, bracts scarious. 



13. 0. Nevadensis, Watson. Leaves ovate to orbicular: petals 3-5 lines long, clawed. 



4. MONTIA, LinnsBUB. 



L M. fontana, L. Stemsn^'eak, often matted: flowers minute: capsule globose. 



2. M. Howellii, Watson. Leaves opposite the scarious triangular bracts of raceme*. 



6. CALYPTB.rDITJM, NuttalL 



1. O. oznbellatiun, Greene, Umbel capitate: petals 4: stamens 3: style exserted. 

 This plant is Spragv^ea umhellata, Torr. 



2. C. quadripetalum, Watson. Petals 4: stamen 1: stigmas nearly sessile. 



3. C. roseum, Watson. Petals 2, much shorter than the unequal sepals. 



4. C ni,oixandniia, Nutt. Petals 2, equalling the sepals, a line long or less. 



