These data files consist of demographic measures taken on marked plants of the federally endangered Dicerandra christmanii from natural populations (in open gaps and roadsides), an augmented population, and introduced population. Data were collected from seven populations across two sites from 199 –2018 although populations were initiated in different years. 

Sampling of the natural population of D. christmanii began in 1994 at its only known protected population Flamingo Villas Lake Wales Ridge National Wildlife Refuge (LWRNWR) owned and managed by the USFWS. Initiated in 1994, plants were sampled quarterly (January, April, July and October) at a single population (FV north road) within a 45 m by 2 m belt transect with six, 1 m wide perpendicular transects extending out at various lengths. Sampling efforts within the six belt transects were reduced to single 1 x 1 m quads in 1996 with plant tags outside the quads or longer transects pulled and coded as “no longer in transect” (code 6). Two additional transects were added in 1999; FV south road west was a 51 m long, 1 m wide transect and FV south road east was a 31 m long, 1 m wide transect. A fourth population was added in 2000, FV south gaps, sampling plants in 16 gaps.

We augmented populations of D. christmanii in the southern section of Flamingo Villas LWRNWR in 2010 using seeds sown in the field and transplants from cuttings and seedlings germinated in a greenhouse. This was an experimental augmentation, with some gaps experimentally burned in June 2009 prior to the augmentation. Altogether we introduced 4,000 seeds, 160 seedling transplants, and 40 stem-cutting transplants into 40 gaps on 19 August 2010. All gaps were initially watered via a gravity-fed irrigation system; irrigation ceased in June 2011.

In 2012, we introduced D. christmanii plants to Carter Creek LWRNWR, a protected property just north of the protected populations at Flamingo Villas LWRNWR. This experimental introduction examined the effects of propagule type (transplanted seedlings vs. stem cuttings) and supplemental irrigation. Between September 12^th and 13^th 2012, a total of 114 transplants from stem cuttings and 102 seedling transplants were out-planted into 50 gaps. Half of the plants were provided supplemental irrigation, unless sufficient rainfall occurred, through the end of 2012.

Censuses initially occurred quarterly in January, April, July, and October, marking new plants with aluminum tags and pin flags and recording survival since the last census. At each census, we recorded if a plant had survived, died (for the first time), was previously dead, a new plant (previously missed) or a new seedling. In October, we took additional measurements, counting the total number of branch tips (>2 cm in length) and flowering branch tips. In 2006, we stopped sampling in July, in 2012, we stopped sampling in January, and in 2014, we stopped sampling in April.

All files are CSV extensions and can be opened with most standard programs (including Excel and R).