646 PRIMULACEAE (PRIMROSE FAMILY) 



§ 2. NAUMBT^RGIA (Moench) Koch. Corolla very deeply b{or Q-1)-parted 

 into linear somewhat purplish-dotted divisions, with or without a small tooth 

 in each sinus; fiiaments distinct^ equal; leaves opposite (rarely whorled), 

 the lowest scale-like. 



6. L. thyrsiflora L. (Tufted L.) Smooth (or with loose scurfy pubescence 

 above when young); stem simple, 2.5-8 dm. high ; all but the lower leaves lan- 

 ceolate, the axiis of 1-4 middle pairs bearing short-peduncled head-like or spike- 

 like chisters of small light yellow tlowers. — Cold swamps, Que, to Sask., s. to 

 Pa., 111., Mo., etc. May-July. (Eu.) 



6. STEIRONEMA Raf. 



Corolla rotate, with no proper tube ; divisions ovate, cuspidate-pointed, erose- 

 denticulate above, each separately involute around its stamen. Filaments 

 distinct or nearly so on the ring at base of corolla ; anthers linear. Capsule 

 10-20-seeded. — Leafy-stemmed perennials, glabrous except the ciliate petioles, 

 not punctate, the leaves all opposite, but mostly in seeming whorls on the flow- 

 ering branches. Peduncles slender, axillary, bearing yellow flowers. (From 

 areTpos, sterile, and j'^/ua, thread, referring to the staminodia. ) 



1. S. ciliatum (L.) Raf. Stem erect, 3-12 dm. high; leaves ovate-lanceo- 

 late to broadly ovate, 5-13 cm. long, tapering to an acute point, rounded or 

 heart-shaped at base, all on long ciliate-f ringed petioles ; corolla longer than the 

 calyx ; fruiting calyx 6-10 mm. long, commonly exceeded by the capsule. — Low 

 grounds and thickets. June-Aug. 



2. S. intermedium Kearney. Comparatively low, 2-7 dm. high ; leaves 3-8 

 cm. long, the petioles naked except at base; calyx-lobes commonly exceeding the 

 capsule. {S. tonsum Bicknell.) — Usually in drier rocky soil, Va., Ky., and 

 south w. 



3. S. radicans (Hook.) Gray. Stem slender, soon reclined, the elongated 

 branches often rooting in the mud ; leaves lanceolate to ovate-lanceolate, mostly 

 rounded at base, 2.5-9 cm. long, on slender petioles ; corolla about the length 

 of the calyx; fruiting calyx 3-5 mm. long. — Swampy river-banks, Va. to Mo. 

 and Tex. June-Aug. 



4. S. lanceolatum (Walt.) Gray. Stem erect (or rarely reclined and rooting 

 at the joints) ; leaves lanceolate, 4-10 cm. long, narrowed into a short margined 

 petiole or tapering base, or the lowest short and broad on long petioles ; corolla 

 longer than the calyx ; fruiting calyx 5-8 mm. long. — Low grounds and thickets, 

 Me. to N. Dak., and southw. Var. hybridum (Michx.) Gray, withcauline leaves 

 oblong, is less frequent. 



5. S. quadriflbrum (Sims) Hitchc. Stem erect, 4-angled, slender, 2-9 dm. 

 high, often branched below ; stem-leaves sessile, narroivly linear, elongated, 3-9 

 cm. long, smooth and shining, rather rigid, obtuse, the margins often a little 

 revolute, the veins obscure ; the lowest leaves oblong or spatulate ; corolla longer 

 than the calyx, the lobes conspicuously pointed ; fruiting calyx 5-7 mm. long. 

 (S. longifolium Gray.) — Banks of streams, N. Y. to Man., s. to Va. and Mo. 

 June-Sept. 



7. TRIENTALIS L. Chickweed Wintergreen 



Corolla spreading, flat, without tube. Filaments slender, united in a ring at 

 the base ; anthers oblong, revolute after flowering. Capsule few-seeded. — Low 

 and smooth perennials, with simple erect stems, bearing a few alternate usually 

 minute and scale-like leaves below, and a whorl of thin veiny leaves at the sum- 

 mit. Peduncles one or more, very slender, bearing a delicate white and star- 

 shaped flower. (A Latin name, meaning the third part of a foot, alluding to 

 the height of the plant.) 



1. T. americana (Pers.) Pursh. (Star Flower.) Spreading by very slen- 

 der elongat(;d ri)otstocks, rarely producing long stolons from the upper axils ; 

 leaves elongated-lanceolate, tapering to both ends; petals finely pointed.—' 

 Woods, Lab. to Man., Minn., 111., and Va. May-July. 



