646 PRIMULACEAE (PRIMROSE FAMILY) 



2. NAUMBtJRGIA (Moench) Koch. Corolla very deeply 6(or Q-1}-parted 

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

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

 the lowest scale-like. 



6. L. thyrsiflbra 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 axils of 1-4 middle pairs bearing short-peduncled head-like or spike- 

 like clusters of small light yellow flowers. Cold swamps, Que. to Sask. , s. to 

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



6. STEIRONEMA Baf. 



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 

 (rretpos, sterile, and vrnj.a, 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 soiJ, 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, narrowly 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. TRIENT.ALIS 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 elongated rootstocks, 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. 



