This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol1", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Bulbous herbs with erect leaf-bearing stems and large solitary (rarely 2) erect flowers. Perianth campanulate, the segments distinct, erect or erect-spreading, deciduous, usually with a spot at the base, but without a nectar-gland; stamens 6, hypogynous, shorter than the perianth; anthers erect, basifixed; ovary nearly or quite sessile, 3-celled; ovules numerous; capsule oblong or globose; seeds numerous, flat. [Ancient name.]
Fifty species or more, natives of Europe and Asia. Type species: Tulipa sylvestris L.
Tulipa sylvestris L. Sp. PI. 305. 1753.
Bulb ovoid, 1' long or less, covered with dark brown scales. Stem about 2° high, bearing 1-3 linear-lanceolate grayish-green acuminate leaves; flower yellow, 3'~4' broad; inner perianth-segments somewhat broader than the outer, acute; filaments pubescent at the base; capsule narrowly oblong, 3-angled; seeds obovoid, brown.
Meadows, Bucks County, Pennsylvania. Ad-ventive from Europe. April-June.