652 PRIMULACKIE 



10. CENTUNCULUS L. False Pimperxel. Chaffweed. 



Small depressed caulescent annuals. Leaves alternate or the lower opposite. 

 Flowers minute, axillarA-, solitary'. Sepals 4 or 5, united below, persistent. 

 Corolla not exceeding the cah-x; tube subglobose: lobes entire, spreading. Sta- 

 mens 4 or 5, inserted in the throat: filaments dilated: anthers cordate. Ovarj' 

 1-ceUed; style filiform: stigma capitate. Ovules numerous, half-anatropous. 

 Capsule subglobose. circumscissile : seeds numerous. 



1. C. minimiis L. Slender annual, 2-15 cm. high; leaves subsessUe, obo- 

 vate or oblong. 4-S mm. long : flowers sessile or nearly so : sepals linear or linear- 

 lanceolate, acuminate; corolla pink : lobes lanceolate. Moist soil: 111. — Fla. — 

 L. Calif.— B.C.: Eu. and S. Am. Plain— Submont. Ap-S. 



11. GLAUX (Toum.) L. Bu.ck Saltwort, Sea Milkwort. 



Small caulescent herbs, perennial. Leaves opposite, entire, sessile. Flow- 

 ers small, axillary. Cah^x campanulate, 5-lobed; the lobes petaloid, pink or 

 white, imbricate in the bud. Corolla wanting. Stamens 5, inserted at the base 

 of the calj-x, alternate with its lobes: filaments filiform-subulate; anthers cordate. 

 Capsule .5-valved at the top, few-seeded. 



1. G. maritima L. Succulent leafy perennial; stems 0.5-3 dm. high, gla- 

 brotis; leaves sessile, from oval to linear-oblong, 4r-12 mm. long: cah-x campanu- 

 late, about 3-4 mm. long, pinkish or white: lobes oval, roimded. Saline soil: 

 Newf. — ^X.J. — Colo. — Ore. — Alaska; Eurasia. Plain — Submont. Je-Au. 



12. DODECATHEON L. Shooting Star, Americax Cowslip, 



Bird-bills. 



Scapose perennials, with short rootstocks. Leaves in basal rosettes. Flow- 

 ers umbellate on sohtarj- scapes, nodding. Calj^x-lobes 4 or 5, longer than the 

 tube, reflexed in flower. Corolla h>-pog\-notis: tube ver\- short: lobes 5 or 4, 

 imbricate in the bud, reflexed, many times as long as the tube. Stamens 5 or 

 4, exserted; filaments usually tmited: anthers attached by their bases. Ovary 

 l-ceUed, free: style filiform: stigma capitate. 0"vules numerous, half-anatropous. 

 Capstile partially 5-valved, the verv- apex in some species separating off as a hd. 

 Seeds numerous. 



Anthers subsessfle or nearly ^: tube of the filaments if any less than 0..5 mm. long. 



Leaf-blades thin, ovate, simiately dentate, truncate, subcordate or obtuse at the 



base: anthers strictly sessile. ' 1. D. dentatum. 



Leaf-blades thicker, linear, oblanceolate or oval, entire or minutely denticulate, 

 gradually tapering at the base. 

 Filaments purple: plant with a distinct, often bulblferous rootstock. 

 Leaf-blades Unear or narrowly linear-oblanceolate, entire. 



Plant low; corolla-lobes 10-lS mm. long. 2. D. alpinum. 



Plant tall; corolla-lobes 20-2-5 mm. long. .3. D. Jeffreyi. 



Leaf -blades broadly oblanceolate or elliptic; margins caUous-denticiilate. 



4. D. ririparurn. 

 Filaments yeUow; rootstock merely a short vertical crown, bearing the leaves and 



fleshy roots; bulblets none. 

 Leaves glabrous. 



Leaves distinctly petioled. 



ScaE)e low, few-flowered; capsule circumscissile near the apex; con- 

 nective rugose. 

 Leaf-t!ades oval, elliptic, or obovate; capsule 10-12 mm. long. 



5. D. conjugens. 

 Leaf-blades oblanceolate or oblong, spatulate: capsule 15—20 mm. 



long. - 6. D. ajlindrocarpum. 



Scai)e taU, many-flowered; capsule opening by valves from the apex; 

 connective not rugose. 7. D. multiflorum. 



Leaves subsessUe. 8. D. pulchrum. 



Leaves pubescent. 9. D. pubescens. 



Anthers not subsessfle; filaments united into a distinct tube, 1-3 mm. long. 

 Leaves glabrous. 



Capsule circimascissUe near the apex: anthers more than twice as long as the tube 

 of the filaments. 

 Fflaments and throat of the corolla indigo blue: leaf-blades obovate. 



10. D. Hendersoni. 

 Fflaments and throat of the coroUa yellow. 



Petals oblong-lanceolate, obtuse or acutish- 6. D. cylindrocarpum. 



