80 . NYCTAGINACEAE 



Flowers solitary in the involucre, on short slender pedicels; fruit nearly glabrous. 



7. A. glabra. 

 Flowers 2-3 in the involucres, subsessile; fruit decidedly pubescent. 



Lower leaves ovate, rounded at the base. 8. A. sessilifolia. 



Lower leaves lanceolate to linear, tapering at the base. 



Leaves of the cymes much reduced and bract-like; upper portion of the 



stem densely aiid finely puberulent. 9. A. bracteata. 



Leaves of the cymes neither much reduced nor bract-like. 



Leaves erect or ascending; lobes of the involucre rounded or broadly 

 triangular-ovate. 

 Plant prostrate or diffuse; involucres and branches of the inflor- 

 escence densely viscid-hairy. 10. A. diffusa. 

 Plants more simple, erect or ascending; branches of the inflorescence 

 usually merely \'iscid-puberulent. 

 Leaves from ovate- or obovate- to linear-lanceolate, usually 



over 5 mm. wide. 11. A. decumbens. 



Leaves narrowly linear, less than 5 mm. wide. 12. A. linearis. 

 Leaves divergent, distinctly petioled; lobes of the involucre elliptic or 

 oval. 13. A. divaricata. 



9. WEDELIELLA Cockerell. l. W. incarnata. 



Family 41. TETRAGONIACEAE. Carpet- weed Family. 



Hypanthium wanting; capsule loculicidal; leaves whorled. 1. Mollugo. 



Hypanthiura manifest; capsule circumscissile ; leaves opposite. 2. Sesuviu.m. 



1. MOLLUGO L. Indian Chickweed, Carpet-weed. i. M. verticiUata. 



2. SEStrVIUM L. Sea Purslane. i. S. sessile. 



Family 42. PORTULACACEAE. Purslane Family. 



Ovary wholly superior. 



Styles or stigmas 3-8; sepals not accrescent; inflorescence not secund. 



Sepals deciduous, scarious; capsule 3-valved; plant with fleshy rootstock or root; 



ours with terete leaves. 1. Tai.inum. 



Sepals persistent, at least in part herbaceous. 

 Capsule 3-valved; styles 3. 



Plants with a corm, or a fleshy root, crowned with a short caudex; caulino 



leaves opposite; ovules usually 6. 2. Cl.\ytoni.\. 



Plants annual, or perennial, with slender rootstocks; ovules usually 3. 

 Stem-leaves opposite. 



Stem-leaves a single pair; plant neither rooting at the nodes nor 



flagelhferous. 3. Limnia. 



Stem-leaves of several pairs; plant floating and rooting at the nodes, 

 usually flagelhferous. 4. Crunocallis. 



Stem-leaves alternate. 



Leaves very fleshy; perennials, with bulblets and creeping stems or 



stolons. 5. Naiocrene. 



Leaves not fleshy; erect annuals, without b alblets and stolons. 



6. MONTI.^STRUM. 



Capsule circumscissile near the base. 



Sepals 6-8; scape jointed above the middle, with 2 or more subulate bracts 



at the joint. 7. Lewisia. 



Sepals 2; scape not jointed ne%v the middU3. 



Plants with a thick perennial root, bearing one or several short caudices . 



8. Oreobroma. 

 Plants with a globular corm and a slender stem bearing 2-3 verticil - 



late leaves. 9. Erocallis. 



Stvles or stigmas 2; capsule 2-valved; sepals scarious and accrescent; inflorescence 

 " secund. 10. Spr.'VGUEA. 



Ovary partly inferior, circumscissile; ours low spreading leafy annuals, with flat leaves. 



11. PORTUL.\CA. 



1. TALINUM Adans. Fame-flower. 



Plant scapose, from a corm-like rootstock. 



Flowers about 1 cm. wide; stamens 5-10. 1. T. parviflorum. 



Flowers 2-3 cm. wide; stamens 30 or more. 2. T. calycinum. 



Plant low and spreading, from a branched rootstock ; flowers axillary. 3. T. brachypodum. 



2. CLAYTONIA (Gronov.) L. Spring Beauty, Ground-nut. 



Plants with corms; basal leaves few. 



Stem-leaves linear or narrowly lanceolate, 1-ribbed or indistinctly 3-ribbed. 



Corolla orange. 1. C. chrysantha. 



Corolla wliite or pink. 



Sepals oblong to oval, rounded at the apex; corms usually with 1 or 2 stems. 

 Stem-leaves petioled; corolla white, with rose-colored veins. 



2. C. rirginica. 



